JPH0679755B2 - Tundish weir desorption device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device used for attaching and detaching a weir in the reconditioning of a tundish for continuous casting of molten steel and the like.

[Conventional technology]

Conventionally, the rehabilitation and maintenance of used tundish has been carried out as follows.

First, remove the used tundish stopper, tundish cover, and sliding nozzle from the main body, and then cool the inside of the tundish to 100 ° C or less.

After cooling, the weir provided inside the tundish main body was broken with a dismantling machine, after removing the metal attached to the bottom surface, the slag attached to the side wall was removed and the lining coating material was disassembled, and the disassembly was completed. The tundish is inverted by a reversing machine and the demolition waste is discharged. After that, a new coating material is applied to the entire inner surface of the tundish by ironing or spraying, and after the coating material is solidified, the weir is attached. To install the weir, an operator enters the tundish, fixes the weir suspended by a crane at a predetermined position with a wedge of a brick piece, and further applies mortar so as to cover the wedge and strengthens it.

The tundish that has been maintained in the above process is a cover,
After mounting the stopper and sliding nozzle device, they are transported to the casting floor and preheated before being reused.

[Problems to be Solved by the Invention]

In this way, the conventional tundish regeneration maintenance is particularly inefficient in the work of attaching and detaching the weir, and in addition, the worker needs to wait for the inside of the tundish body to cool down. However, this leads to a decrease in work efficiency.

The problem to be solved in the present invention is to find a means for efficiently attaching / detaching an internal weir as a means for repairing a tundish hotly and for achieving efficiency in regeneration maintenance for labor saving. .

[Means for Solving the Problems]

The weir mounting and demounting device for a tundish of the present invention comprises a gate-type carriage that straddles a tundish, a vertically movable clamp device for detaching and mounting the weir, and a plurality of vertically movable swivels for spraying fixing mortar when mounting the weir. A spray nozzle is provided.

Further, this tundish weir desorption device may be provided with a material tank having a plurality of coating discharge holes for supplying a spray material to the nozzle.

[Action]

 The operation of the device of the present invention can be performed as follows.

After transporting the used tundish to the designated place,
Move and fix the carriage to the weir position, operate the elevating cylinder in the clamp device to lower the clamp at the tip, operate the operating cylinder to grab the weir, operate the elevating cylinder again to place the clamp above the tundish. Lift the dolly to and move away the weir. In addition, when installing the weir, the weir is installed by an operation reverse to that in the case of removing the weir, and after installation, the nozzle device is swung up and down to fix the amorphous refractory from the front and back of the weir.

As the amorphous refractory, refractory mortar, alumina type, magnesia type, and other ordinary refractory for spraying can be used.

Further, as the spraying method, a spraying method in which a spraying material is melted or semi-melted can be applied.

Furthermore, it is also possible to perform spraying from both sides of the weir using a plurality of nozzles.

Further, it is also possible to adjust the fixing strength of the weir by adjusting the amount of spray material, thermal spray material or the like.

By setting the spray angle of the spray material to the weir surface to 20 to 60 °, the rebound of the spray material is prevented,
Efficient mounting can be performed.

When spraying, the weir fixing force varies greatly depending on the size of the weir, the weir and tundish material, the spray material used, and the construction conditions, so check the weir fixing force under each construction condition in advance. It is preferable to keep.

In particular, when fixing the weir during thermal spraying, a large amount of spraying material can secure a large fixing force. Therefore, if the construction range or the amount of construction is increased, a large collection force will be required when collecting the weir after use. Or damage to the tundish side wall, and more than the ability of the recovery device is required, which leads to damage to the recovery device, so use a spraying material etc. used in advance,
It is important to check the weir fixing force based on the construction amount and thermal spraying conditions.

In this way, the weir in the tundish can be attached and detached by mechanical means without the worker entering the inside,
It will be possible to carry out hot maintenance.

〔Example〕

The attached figures show an embodiment of the device according to the invention. 1 is a plan view,
FIG. 2 is a side view and FIG. 3 is a front view, each of which is shown by a partial cross section.

In these figures, T indicates a used tundish body placed on the work floor. As shown in FIG. 3, reference numeral 1 denotes a gate type carriage that runs across the tundish main body T, and a motor 3 shown in FIG. 2 on a rail 2 laid on the maintenance floor.
Run by. On the underframe 4 of the gate type trolley 1, a clamp device 5 and a spray nozzle device 6 used for removing and installing a weir, and a material tank 7 for supplying a spray material to the spray nozzle device 6 are further provided. Is provided.

As shown in FIG. 2, the clamp device 5 is a clamp frame that moves up and down in the guide frame 51 by an elevating guide frame 51 on the underframe 4, and a cylinder 52 and a roller 53 fixed to the upper part of the frame.
Have 54. Further, the clamp frame 54 is provided with a clamp 56 driven by a cylinder 55.

Further, as shown in FIG. 1, the spray nozzle device 6 has a swirling tower 62 that swivels by driving a cylinder 61. Further, as shown in FIG.
There is a pipe 64 that can be moved up and down, and a spray nozzle 65 is provided at the tip of the pipe 64.
Two spray nozzle devices 6 are provided in the traveling direction of the carriage with the clamp device 5 interposed therebetween. Further, the spray nozzle device 6 has a structure in which spray material is supplied from a material tank 7 also provided on the carriage.

In this device, after the used tundish T is transported to a predetermined position, the carriage 1 is moved and fixed to the position of the dam S, and then the lifting cylinder 52 of the clamp device 5 is operated to lower the clamp 56 at the tip to operate. The cylinder 55 is operated to grab the weir S, and again the elevating cylinder 52 is operated to lift the clamp 56 above the upper surface of the tundish T and move the carriage 1 to remove the weir S.

In addition, when installing the weir S, the weir S is installed by an operation reverse to that of the above removal, and after the installation, the nozzle device 6 is swung up and down, and the mortar material is sprayed and fixed from before and after the weir S.

In this spraying, the spraying nozzles 65 arranged on the weir surface at a spraying angle of 20 to 60 ° with respect to the dam S are used to prevent rebound and improve spraying efficiency. It is convenient for you.

It is not necessary to densely fill the gap between the tundish T side wall and the weir S with the spray material. If the space is filled, a large recovery force is required when collecting the weir after using the tundish, which leads to damage to the weir or the sidewall of the tundish during recovery.

In addition, when performing spraying or spraying, spraying or spraying using multiple spray nozzles or spray nozzles can be performed in a shorter time with a small amount of spray material or a small amount of spray material. Can be securely fixed.

That is, by performing the construction simultaneously from both sides of the weir using a plurality of spray nozzles 65, it is possible to suppress the loss amount of the spraying or spraying material passing through the gap between the side wall of the tundish T and the weir S, and a predetermined amount of spraying. Construction can be performed without filling the gap between the side wall of the tundish and the weir with a coating material or thermal spray material. In particular, if the gap is as large as 30 to 60 mm, the spray material, thermal spray material, etc. will pass through the gap and the loss will increase.
By constructing from both sides of the weir S, the loss can be significantly suppressed.

Further, by constructing from both sides of the weir S, a gap is created between the side wall of the tundish 1 and the weir S, and a fixed weir fixing force can be secured by a predetermined amount of spraying regardless of the size of the gap. It should be noted that the void is composed of a portion which is not filled with the spraying material or the thermal spraying material and a portion which is filled with the respective materials but does not fulfill the adhesive function firmly.

Table 1 shows the experimental results when spraying both sides with one nozzle and when spraying with two nozzles when there are various gaps.

The test results for an actual furnace in which six weirs were sprayed and fixed on a tundish side wall temperature of about 500 ° C in a 65 t tundish are shown below.

The gap between the tundish side wall and the weir before construction was 5 to 30 mm on each side of the weir. The properties of the spray material used are shown in Table 2. Table 3 shows the spraying conditions.

The spray nozzle was a wet type, and two nozzles were used to mix the added water at hand, and the spray nozzles were installed simultaneously from both sides.

Except for preparatory work such as production of wedge bricks, it took two hours for two people to attach the six weirs in the case of using the conventional wedge brick and mortar refractory, but with the spraying method of the present invention, Two
It became possible in 30 minutes by people. The amount of spray material used per weir was 20 to 28 kg.

After installing a weir by spraying and confirming the weir's fixing force after preheating the tundish, we found that 28 kg of spray material was used.
It was 3500 kg, and 2500 kg using 23 kg of spray material.

The results obtained by using the tundish on which the weir was constructed by the above-mentioned spraying method under the conditions shown in Table 4 were good results with no overturning / floating of the weir and no abnormalities in the quality of the cast product.

Furthermore, the recovery capacity of the weir after use is 4000 kg and 6000 kg,
The weir was not damaged during recovery.

Also, in the same way, 6 weirs in a 65t tundish,
Thermal spraying was performed under the condition that the tundish side wall temperature was about 500 ° C.

As the thermal spray material, as shown in Table 5, an alumina material was used. The thermal spraying equipment was a set of oxygen propane type thermal spraying equipment, and was constructed under the conditions shown in Table 6. The amount of construction is per weir
10kg was constructed.

The installation of the six weirs took 50 minutes by two people. Molten steel temperature 15
The results of using 1750 tons for casting for 340 minutes at 90 to 1610 ° C were good results without the weir falling or rising.

In the conventional method, 4 to 6 wedge bricks and about 200 kg of mortar were used per weir, but it became possible in a short time with a very small amount of thermal spray material.

Furthermore, using 65 t tundish, the gap between the tundish base material and the weir was adjusted to about 20 mm, and construction experiments were conducted by various methods. After the construction, heating power at 1000 ° C. for 1 hour was investigated to investigate the weir recovery power. The experimental results are shown in Table 7.

Note that at least 360 kg is required to use this dam in an actual machine without any abnormality.
The above fixing force is required.

In the conventional method, the fixing force is influenced by the attachment situation of the wedge brick, and the variation of the fixing force is large, whereas in the method of the present invention, the predetermined fixing force can be secured by the usage amount of the construction material, and in a short time. Construction is now possible.

Thus, the device of the present invention allows mechanical attachment and detachment of the weir to the tundish.

〔The invention's effect〕

 The device of the present invention can achieve the following effects.

(1) Cooling is not required when regenerating and maintaining the tundish, and the maintenance time can be reduced accordingly.

(2) As a result, the number of spare tundish bases can be reduced in equipment such as steel making, and the equipment operating rate is improved.

(3) Labor required for maintenance can be significantly reduced, and labor saving can be achieved.

[Brief description of drawings]

The attached figures show an embodiment of the device according to the invention. 1 is a plan view,
FIG. 2 is a side view and FIG. 3 is a front view, each of which is shown by a partial cross section. 1: Gate type trolley, 2: Rail 3: Motor, 4: Underframe 5: Clamping device, 6: Spraying nozzle device 7: Material tank 51: Elevating guide frame, 52: Cylinder 53: Roller, 54: Clamp frame 55 : Cylinder, 56: Clamp 61: Cylinder, 62: Swirl tower 63: Roller, 64: Pipe 65: Spray nozzle S: Weir, T: Tundish body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kosuke Kurata Kurata Kurata, No. 1 Tobahata-cho, Tobata-ku, Kitakyushu, Fukuoka Prefecture (72) Inside the Yawata Works, Nippon Steel Co., Ltd. Machi No. 1 No. 1 New Nippon Steel Co., Ltd. Yawata Works (72) Inventor Masato Nakai No. 1 No. 1 Hitabatacho, Tobata-ku, Kitakyushu, Kitakyushu, Fukuoka Prefecture (72) Inventor Matsumoto Shoji 1-1 Hibatacho, Tobata-ku, Kitakyushu, Fukuoka Prefecture Inside the new Nippon Steel Co., Ltd. Yawata Works (72) Inventor, Yasuyuki Wada 1-1, Hibatacho, Tobata-ku, Kitakyushu, Kitakyushu, Japan Ironworks (56) References JP-A-58-77753 (JP, A) Practical use Sho-59-119367 (JP, U)

Claims (1)

[Claims] 1. A tandem carrier that straddles a tundish is provided with a vertically movable clamp device for detaching and mounting a weir, and a plurality of spray nozzles that are vertically rotatable to fix a mounting weir. Dish weir desorption device.