JP3493948B2 - Taphole repair device and taphole repair method for molten metal container - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tap hole repairing apparatus and a tap hole repairing method for a molten metal container capable of repairing an inner wall surface of the tap hole provided in a molten metal container such as a converter. . More specifically, the present invention relates to the melt-dissipating portion of the tap hole provided in the molten metal container.
The present invention relates to a tap hole repairing apparatus and a tap hole repairing method for a molten metal storage container, which enables safe, quick, and efficient repairing mainly by spraying a basic refractory material.

[0002]

2. Description of the Related Art Molten metal containers such as various heating furnaces and reaction furnaces (for example, steelmaking furnaces such as converters, ladles, tundishes) used in steel manufacturing processes are continuously used at high temperature for a long time. It Therefore, the inner wall surface (for example, the general inner wall surface of the converter or the RH degassing furnace, the inner wall surface of the tapping hole, etc.) is reduced in thickness due to heat damage, and the durability and life are reduced. Conventionally, in order to reduce the thickness reduction and extend the durability and life of the molten metal container, the refractory material to be installed on the inner wall surface has been improved. However, it is difficult to obtain desired durability and life even if it depends only on refractory material improvement.

In particular, in order to repair the above-described tapped hole, conventionally, means for constructing an irregular refractory material has been generally used, and the following means have been performed.

This is the so-called "hole winding method". For example, a repairing die is installed inside the tapping hole after tapping in the converter or after RH vacuum degassing treatment, and by pouring the repairing material from the inside of the furnace, the repairing material is placed in the gap between the furnace wall and the repairing die. After filling, the repair material embedded by the residual heat of the furnace itself, burner flame, etc. is dried and sintered to construct a refractory.

This is the so-called "wet spray repair method". For example, after the steel is tapped, a refractory construction lance is inserted into the tapped hole, a so-called wet spray material containing water is sprayed onto the repair portion, and the repair layer is dried and sintered to construct the refractory.

A method using thermal spraying. For example, inserting a refractory construction lance inside the tap hole after tapping, forming a flame for spraying, spraying a spraying raw material powder consisting of refractory powder toward the repaired part, and spraying while laminating. The refractory is constructed according to

By the way, after the amorphous refractory is applied to the inner wall surface of the tapped hole of the molten metal container, it is necessary to perform heating and drying for a long time in order to make the repair layer into a completely fired body. However, since the repair of these inner wall surfaces is usually performed in a short time after passing through the operation time after tapping, sufficient drying time cannot be secured in many cases. Therefore, the repair layer is often used without being made into a sufficiently fired body, and in such a case, the durability of the repair layer is significantly deteriorated.

For this reason, recently, instead of the wet spraying method, a method by thermal spraying which does not require a long drying time has been actively studied.

As a conventional technique of the flame spraying method, Japanese Patent Laid-Open No.
JP-A No. 60-110362 discloses that a first powder ejection port is provided in the center of the tip of a combustion flame nozzle, and a plurality of flame ports are annularly provided around the first powder ejection port. A means for utilizing LPG-O ₂ combustion flame by disposing a plurality of second powder ejection ports in a ring shape on the outer circumference of the group and a plurality of flame openings in a ring shape on the outer circumference of the second powder ejection port is disclosed. There is.

In this proposal, in order to uniformly mix the flame and the thermal spraying raw material powder for a sufficiently long time, the flame and the thermal spraying raw material powder are jetted alternately from the multi-hole nozzle, and in a high temperature long flame. The thermal spray raw material powder is melted and adhered to the wall surface.

Further, in Japanese Patent Laid-Open No. 59-59874, a coaxial flow turbulent diffusion combustion flame is formed and the visible flame length is
It is disclosed that the thermal spraying is performed while supplying the thermal spraying raw material powder to the positions of 1/15 to 1/3. This is a means adopted also in plasma spraying, for example.

The means for these proposals are
By supplying the thermal spraying raw material powder into the thermal spraying flame, the thermal spraying raw material powder is melted by the heat of the thermal spraying flame. here,
Whether or not the thermal spraying raw material powder can be melted in the flame for thermal spraying is determined by the flame temperature, the heating time (that is, the thermal spraying distance) and the particle size of the thermal spraying raw material powder. The combustion temperature of flame spraying is at most about 2,000 to several hundred degrees unlike plasma spraying at ultra-high temperature (tens of thousands of degrees Celsius).
The heating time is 0.01 to 0.001 sec or less, assuming that the ejection speeds are several tens of cm and several tens to 100 m / sec, respectively. In order to melt the powder in such a short time, it is necessary to control the particle diameter of the thermal spraying raw material powder to not more than 0.1 mm.

On the other hand, the applicant of the present invention previously disclosed in Japanese Patent Laid-Open No. 6-71200.
According to the gazette, the thermal spray raw material powder containing the metallic powder for combustion and the oxygen gas for combustion are mixed, and thermal spraying is performed by utilizing the combustion heat (a kind of thermite reaction heat) of the metallic powder for combustion on the collision wall surface. Suggested a way to do it. This means has a very simple structure because it is composed only of a nozzle that mixes the thermal spray raw material powder and the oxygen gas for combustion.

Furthermore, the present inventors have previously proposed Japanese Patent Application No. 8-
By No. 4374, we proposed a multi-tube burner whose main heat source is the combustion heat of metal powder for combustion on the collision wall surface. this is,
In order to compensate for the disadvantages of various thermal spraying methods, the invention is an invention in which a thermal spraying burner having a coaxial jet structure composed of multiple tubes sprays a thermal spraying raw material powder containing a small amount of metal powder for combustion.

[0015]

In order to melt the sprayed raw material powder by the combustion flame spraying method, as described above,
Since there are large restrictions on flame temperature and heating time, it is necessary to control the particle size of the thermal spray raw material powder within a predetermined range. Therefore, the cost of the sprayed raw material powder to be sprayed is increased, and the nozzle shape is complicated, and it is difficult to manufacture the nozzle.

That is, in the invention proposed by Japanese Patent Laid-Open No. 60-110362, the structure of the multi-hole nozzle is complicated and the cooling capacity is lowered, and there is a risk of powder clogging in the channel. Therefore, it is difficult to reduce the size, and there is a problem that the range of application to various heating furnaces and reaction furnaces used in the steel manufacturing process is significantly limited. Further, since the flame used is of the premixing type, there is a risk of flashback in the nozzle, and there is a problem in terms of safety.

In the invention proposed by Japanese Patent Laid-Open No. 5-112807, the flame is premixed, so there is a risk of flashback. In addition, this proposal using Al powder as a heat source results in inefficient construction with an adhesion rate of less than 50%.

In the invention proposed by Japanese Patent Laid-Open No. 6-71200, it is essential that the repair surface is at a high temperature in order to burn the metal powder for combustion. Therefore, hot repair is possible, but there is a problem that the adhesion yield is lowered in warm or cold. In addition, there are problems of flashback and large capacity (difficult to downsize).

Furthermore, the present inventors have previously filed Japanese Patent Application No. 8-4374.
According to the multi-tube burner proposed in No. 3, it is certainly possible to achieve both safety and high efficiency of thermal spraying. However, during hot work, especially when the surface to be repaired is 1000 ° C. or higher, since the thermal spray raw material powder also uses the basic aggregate as the main raw material, the thermal spray layer is formed during the lamination process during thermal spraying. Remelting forms a kind of molten pool. Therefore, if the thickness of the laminated thermal spray coating exceeds the limit value, splashing may occur again, and it may not be possible to obtain a thermal spray coating having a desired thickness. This is because the viscosity of the basic aggregate in the liquid phase is significantly lower than that of SiO ₂ .

As described above, in the conventional basic refractory repairing means for performing thermal spraying by using the thermal spraying raw material powder containing the basic aggregate as the main raw material, any of them can be repaired safely, promptly and efficiently. Could not be done.

Further, it is more difficult to repair the inner wall surface of the tap hole of the molten metal container by spraying such a basic refractory material. For example, Japanese Patent Laid-Open No.
In −77515 publication, a burner restricted to a spraying distance of 25 to 125 mm was used, while the positioning for inserting the refractory construction lance was performed by a camera from the outside of the tap hole of the converter, and the inner diameter was 100 to 100 mm. An invention has been proposed in which a refractory construction lance with a diameter of 50 mm is inserted at a desired position inside a tapped hole of 300 mm to repair the refractory by thermal spraying.

However, the tap hole of the converter is usually 1500 to 2000.
With a length of about mm, and considering the space between the converter and the work floor, the refractory construction lance must be cantilevered for at least 3000 mm or more. Therefore, there is a high possibility that the refractory construction lance is bent and the tip end vibrates like a pendulum during driving and interferes or collides with the inner wall surface of the tapped hole.

In order to eliminate the bending of the refractory construction lance, it is sufficient to increase the outer diameter of the refractory construction lance to increase the rigidity, but this makes it difficult to monitor the tapped hole from the outside with a camera, and Therefore, the positioning accuracy is unavoidably deteriorated.

Further, a sleeve for forming the inner wall surface of the tapped hole.
In reality, the bush is replaced with a new one several tens of times during a period of one furnace cost of the converter main body. This replacement sleeve is 1800mm long
The accuracy is ± 0.5mm, and it is rarely installed according to the design position of the tapped hole, and its axis is irregularly displaced about 1 to 2 degrees with respect to the axis of the tapped hole. It Also, the damage to the sleeve is not uniform. Therefore, each time the sleeve is replaced, the relative axial center of the tapped hole deviates from the designed position. Moreover, the iron shell forming the tapped hole is often distorted.

Therefore, in repairing, it is practically impossible to match the axis of the refractory construction lance with the axis of the tap hole in a short time by monitoring the camera from the outside of the tap hole.

As described above, regarding the repair of the inner wall surface of the tap hole of the molten metal storage container by thermal spraying, there are inherent problems listed below.

(1) In order to construct an irregular refractory material, it is necessary to install a casting mold called a core inside the tap hole.
Since the work is performed hot, it is a high-heat work, which is not preferable for safety.

(2) The time required for repair is long, the operating rate of the molten metal container is lowered, and the productivity is lowered.

(3) At the time of thermal spraying of an indefinite refractory material, even if a remote operation is carried out in the instrument chamber to accurately stop the converter during turning to stop the position of the tapped hole at a desired position,
In practice, rattling and the like of the converter turning drive system and the like are inevitably present, so it is difficult to always keep the tapped holes at the same position. Therefore, in order to make the center axis of the tap hole and the axis of the refractory construction lance to be inserted into the tap hole accurately match, the refractory construction lance must be finely adjusted after insertion. For this reason,
The setup time for repair is long and the repair cannot be performed quickly.

(4) Since the inner diameter of the tapped hole is relatively small and the gap between the tapped hole and the lance for refractory construction is small, the center axis of the tapped hole and refractory construction can be monitored by an external camera. It is virtually impossible to match the axis of the lance.

Here, a main object of the present invention is to provide a tap hole repairing apparatus and tap hole repairing device for a molten metal container capable of repairing an inner wall surface of a tap hole provided in a molten metal container such as a converter. To provide the law.

More specifically, an object of the present invention is to repair the melted portion of the basic refractory in the tap hole of the molten metal container in a hot, safe, quick and efficient manner mainly by thermal spraying. It is an object of the present invention to provide a tap hole repairing apparatus for a molten metal container and a tap hole repairing method.

[0033]

SUMMARY OF THE INVENTION Here, the gist of the present invention is to insert the center of the tap hole provided in the molten metal container to the position of the tap hole and the damage condition of the inner surface. Observation and measurement Observing and measuring lance, refractory construction lance inserted inside the tap hole and constructing refractory inside the tap hole, observation lance and lance drive mechanism equipped with lance and refractory construction lance, and observing A molten metal accommodating container outlet hole repairing device, comprising: a control device that drives and controls a refractory construction lance based on a movement trajectory of the measurement lance to the outlet hole.

According to the molten metal storage container tap hole repairing apparatus according to the present invention, the position of the tap hole is formed by inserting the observation measurement lance into the tap hole of the molten metal container by using the lance driving mechanism. Based on the movement trajectory of the observation and measurement lance to the tap hole and the construction range determined by the measurement results, the refractory construction lance is installed inside the tap hole using the lance drive mechanism. Move and insert to install a refractory in the above construction range.

From another point of view, according to the present invention, there is provided a first flow path which is formed independently from each other in order from the central portion toward the outside, and which has a fluid ejection port formed at each tip.
A burner having a second flow path and a third flow path, a first supply system for supplying the first combustion oxygen gas to the first flow path, and a supply and non-supply of combustion metal powder to the second flow path. And a third supply system for supplying the second combustion oxygen gas to the third flow path, the second supply system supplying the spraying raw material powder containing the aggregate as a main material together with the fuel gas. Further, the second supply system operates at different timings to supply the mixed powder of the thermal spraying raw material powder and the combustion metal powder, and the first powder feeder and the second powder supplying the thermal spraying raw material powder. A tap hole repairing device for a molten metal container, comprising: a feeder.

In the tap hole repairing apparatus for a molten metal container according to the present invention described above, all of the three fluid ejection ports are
From the viewpoint of adhesion efficiency, it is desirable to direct a direction inclined at a predetermined inclination angle with respect to the axial direction of the burner.
This inclination angle may be 60 to 80 degrees when the tap hole is arranged in a substantially horizontal direction and 30 to 50 degrees when the tap hole is arranged in a substantially vertical direction. More desirable.

[0037]

[0038]

Further, from another point of view, the present invention provides a mixed powder of a spraying raw material powder containing an aggregate as a main raw material and a combustion metal powder and a spraying raw material on the repair surface of the tap hole of the molten metal container. This is a method for repairing a tap hole in a molten metal container, characterized in that a sprayed coating is piled up by alternately ejecting powder and powder.

[0040]

DETAILED DESCRIPTION OF THE INVENTION

(First Embodiment) Hereinafter, an embodiment of a tap hole repairing apparatus for a molten metal container and a tap hole repairing method according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiment, the converter 2 is used as an example of the molten metal container.

FIG. 1 is a front view of the tap hole repairing apparatus 1 of this embodiment, and FIG. 2 is a top view of the tap hole repairing apparatus 1. Furthermore, FIG. 3 is a view taken along the line CC in FIG.

The tap hole repairing apparatus 1 of the present embodiment comprises a converter 2
It is possible to repair the tapped hole 2a (inner diameter: 200 to 320 mm) hot or cold, improve the durability of the converter 2, prevent the productivity from decreasing due to the repair, and perform the repair work. It improves the safety of.

The tap hole repairing apparatus 1 of the present embodiment comprises a converter 2
Observation lance 3 which is inserted into the tapped hole 2a provided in the inside of the tapped hole 2a and observes and measures the position of the tapped hole 2a and the damage state of the inner wall surface, A refractory construction lance 4 for constructing a refractory on the inner wall of 2a, a lance drive mechanism 26 for mounting the observation and measurement lance 3 and the refractory construction lance 4, and the observation and measurement lance 3 are tapped from the original position (standby position). A control device 27 for controlling the drive of the refractory construction lance 4 based on the movement locus when moved to the hole 2a and inserted.
With.

The observation and measurement lance 3 is made of SUS in this embodiment.
A tubular body consisting of 316 with an outer diameter of 80 mm and a total length of 5700 mm,
The bearings 6a and 7a fixed to the rectangular flat plate-shaped first bed 5a are rotatably supported in parallel with the plane of the first bed 5a. Further, a gad motor 8a is connected to the rear end side of the observation and measurement lance 3, and the gad motor 8a drives the observation and measurement lance 3 to rotate forward and backward 360 ° around the axis. Further, an ITV camera eye 9 having an automatic focusing function is provided on the tip surface of the observation and measurement lance 3 as a photographing device capable of photographing the inner wall surface of the tapped hole 2a. The ITV camera eye 9 has a wide angle and can always take a panoramic view of the inner wall surface of the tapped hole 2a. ITV camera eye 9
The image photographed by is sent to a monitor (not shown) to notify the operator of the condition of the inner wall surface of the tapped hole 2a.

On the other hand, the refractory construction lance 4 is also fixed to the first by bearings 6b and 7b fixed to the first bed 5b having a rectangular flat plate shape.
It is rotatably supported in parallel with the plane of the bed 5b. A gad motor 8b is also connected to the rear end side of the refractory construction lance 4, and by being driven by the gad motor 8b,
The refractory construction lance 4 rotates forward and backward 360 ° around the axis.

In the present embodiment, the refractory construction lance 4 is a rod-shaped body having an outer diameter of 80 mm and a total length of 5700 mm.
A burner 30 made of SUS 316 with a triple tube structure is installed. FIG. 4 is a vertical cross-sectional view showing the burner 30 used in this embodiment, and FIG. 5 is an explanatory view schematically showing the overall configuration of the burner 30.

In order to improve the thermal spraying efficiency in the thermal spraying of refractory material, it is important to optimize the charging method of the spraying raw material powder, the structure of the apparatus related to the charging method, and the operating procedure.

The burner 30 used in this embodiment is
As shown in FIGS. 4 and 5, the first flow path 31 and the second flow path 32
And a triple tube structure having a third flow path 33. Then, the first supply system 35 for supplying the first combustion oxygen gas to the first flow path 31 and the supply and non-supply of the combustion metal powder 36b to the second flow path 32 can be switched between main and main components. Second supply system 36 to be supplied together with the thermal spray raw material powder 36a as the raw material and the fuel gas
And a third supply system 37 for supplying the second combustion oxygen gas to the third flow path 33, respectively.

As described above, the burner 30 has a triple tube structure having the first flow path 31 to the third flow path 33 which are concentrically formed from the center toward the outside and are formed independently of each other. And at the tip portions of the first to third flow paths 31 to 33,
Fluid ejection ports 31a, 32a, 33a are formed. Fluid outlet 31a
Is formed in a circular shape, and the fluid ejection ports 32a, 33a are formed in an annular shape.

The first flow path 31 communicates with the first oxygen supply port 38 at the rear end thereof, and the first combustion system is connected to the first oxygen supply port 35 through the first oxygen supply port 38. Oxygen gas is supplied.

The second flow path 32 communicates with the powder supply port 39, and the second supply system 36 connected through the powder supply port 39.
From the above, the combustion metal powder 36b is switched between the supply state and the non-supply state, and the fuel gas and the nitrogen gas for powder transportation are supplied together with the spraying raw material powder 36a.

Here, the thermal spraying raw material powder 36a forms a thermal spray coating and is particles made of MgO, ZrO ₂ or Al ₂ O ₃ . In this embodiment, an aggregate powder containing 30% by weight or more of MgO is used. The combustion metal powder 36b is a metal powder for combustion mainly composed of Ca-Si powder or Si powder.

Furthermore, in this embodiment, as shown in FIG. 5, the second supply system 36 is a first powder supply device for supplying a mixed powder of the thermal spray raw material powder 36a and the combustion metal powder 36b. It has a certain hopper 40a and a hopper 40b which is a second powder feeder for supplying the thermal spraying raw material powder 36a. The hopper 40a and the hopper 40b are arranged in parallel in the second supply system 36, and operate at different timings by a switching mechanism (not shown). As a result, the thermal spray raw material powder 36a is constantly switched and the combustion metal powder 36b is intermittently supplied. In this way, by containing the mixed powder of the thermal spraying raw material powder 36a and the combustion metal powder 36b in the hopper 40a, the mixing ratio of the thermal spraying raw material powder 36a and the combustion metal powder 36b can be set to a desired value. It becomes easier to control the temperature and the spraying efficiency can be stabilized.

As the switching mechanism for the hopper 40a and the hopper 40b, a known switching mechanism such as installing a switching valve in a part of the main flow path may be used. Further, in the present embodiment, the control of the switching mechanism is configured to be performed by the control device 27 described later.

In place of such a structure of the hoppers 40a and 40b, one of the hoppers 40a and 40b contains the thermal spraying raw material powder 36a and the other contains the combustion metal powder 36b, and the thermal spraying is carried out. The thermal spray raw material powder 36a may be constantly supplied from the hopper containing the raw material powder 36a, and the combustion metal powder 36b may be intermittently supplied by switching the hopper containing the combustion metal powder 36b. . By doing so, the mixing ratio of the thermal spraying raw material powder 36a and the combustion metal powder 36b can be appropriately changed to an arbitrary value, and the thermal spraying efficiency can be appropriately adjusted.

Fuel gas and nitrogen gas are used to convey the thermal spray raw material powder 36a and the combustion metal powder 36b. Such fuel gas is not particularly limited, and coke oven gas,
A converter gas or the like may be used, and it is preferable to use propane gas, butane gas, or the like, which has a higher calorific value. As a result, it is possible to suppress the decrease in flame temperature and oxygen concentration and improve the thermal spraying efficiency. The spraying efficiency can be adjusted as appropriate by mixing a carrier gas such as nitrogen gas or air into the fuel gas.

Here, the amount of heat for melting the thermal spray raw material powder 36a is supplied mainly by the combustion of the combustion metal powder 36b on the repair surface. The mixing ratio of the combustion metal powder 36b is 5
If it is less than wt%, the calorific value may be insufficient to prevent thermal spraying. On the other hand, if it exceeds 15 wt%, there is no problem from the viewpoint of thermal spraying, but it causes an increase in cost. Therefore, the mixing ratio of the metal powder is preferably 5 to 15% by weight or less, and more preferably 8 to 13% by weight.

As described above, if it is possible to sufficiently secure the heat generation of the combustion metal powder 36b at the beginning of the thermal spraying,
The particle size of the combustion metal powder 36b is not particularly limited. 2.0m
A wide range of grain sizes can be configured from coarse particles of about m to about 0.02 mm.

Further, the particle size of the thermal spraying raw material powder 36a is not particularly limited, and the particle size can be set in a wide range from coarse particles of 2.0 mm to 0.02 mm. The optimum particle size is affected by the outer diameter of the burner 30. Specifically, the particle size distribution is preferably such that the maximum particle size is 1/4 or less of the outer diameter of the burner 30.

Furthermore, the third flow path 33 is connected to the second oxygen supply port 41.
A combustion oxygen gas is supplied from a third supply system 37 that is connected to the second oxygen supply port 41.

The combustion oxygen gas supplied to the first flow path 31 is supplied from the fluid ejection port 31a to the second flow path 32, the thermal spray raw material powder 36a, the combustion metal powder 36b, the fuel gas, and the nitrogen gas. Is ejected from the fluid ejection port 32a, and the combustion oxygen gas supplied to the third flow path 33 is ejected from the fluid ejection port 33a.

In order to effectively use the ejector effect described later, the flow velocity of the combustion oxygen gas jetted from the fluid jet port 31a is set to the spray raw material powder 36a jetted from the fluid jet port 32a or the spray raw material. Powder 36a, metal powder for combustion
It is desirable to increase the flow velocity of the mixed powder of 36b by about 50 m / sec or more.

In the present embodiment, as the first supply system 35, the second supply system 36, and the third supply system 37, various known powder supply systems and oxygen gas supply systems can be used. .

Further, in the burner 30, as shown in FIG. 4, all the fluid ejection ports 31a, 32a, 33a are inclined at a predetermined inclination angle θ (30 to 80 degrees in this embodiment) with respect to the repair surface 42. The distal end portion is formed so as to be bent so as to be oriented in the above direction. That is, in FIG. 4, with respect to the repair surface 42,
The spraying raw material powder 36a, the combustion metal powder 36b, the fuel gas, and the combustion oxygen gas are all ejected at an inclination angle θ of 30 to 80 degrees.

The burner 30 is a well-known triple tube structure, and has an extremely simple structure. Therefore, for example, there are few bent portions such as elbows and flow velocity fluctuation portions, and there is almost no possibility of clogging of the flow path of powder.

Further, the burner 30 is composed of the powder 36a for thermal spray raw material,
Since this is a so-called out-nozzle mixing method in which the combustion metal powder 36b and the combustion oxygen gas are mixed after being ejected, there is no risk of flashback in the nozzle, and safety is particularly high.

Further, the burner 30 basically uses the above-mentioned thermal spraying method utilizing thermite reaction, but by utilizing the ejector effect of the high-velocity oxygen flow ejected from the first flow path 31, The spraying raw material powder 36a and the combustion metal powder 36b ejected from the two flow paths 32 can be sufficiently mixed. Further, an annular fluid outlet 33a for oxygen gas for combustion is provided outside the second flow path 32 to form a flame for thermal spraying, and the thermal spray raw material powder 36a and the metallic powder for combustion 36b are preheated. That is, the burner 30 basically uses, as a spraying material, a mixed powder obtained by mixing the thermal spraying raw material powder 36a with the combustion metal powder 36b which easily becomes a refractory oxide, for example, propane gas or acetylene. It is ejected into the flame for thermal spraying formed by the fuel gas such as gas and the oxygen gas for combustion. Therefore, the flame for spraying formed at the tip of the burner 30 can be made extremely small. Therefore, it is possible to reduce the spraying distance, and it is possible to easily and quickly repair the inner wall surface of the tapped hole 2a by spraying, which is difficult to secure the spraying distance.

Although not shown, the burner 30 has a quadruple pipe structure in which a fourth flow path is formed outside the third flow path 33, and cooling water is circulated in the fourth flow path. The burner 30 is configured to be cooled.

The burner 30 used in this embodiment is constructed as described above.

As shown in FIGS. 1 to 3, in the tap hole repairing apparatus 1 of this embodiment, both the observation and measurement lance 3 and the refractory construction lance 4 have the same outer diameter and are arranged in parallel,
Placed in close proximity. This ensures that the observation and measurement lance 3 and the refractory construction lance 4 are inserted into the tapped hole 2a while the overall size of the apparatus is reduced.

The first beds 5a and 5b are arranged side by side in the respective width directions to form a rectangular flat plate-shaped second bed 11 having a size that covers the entire relative movement range of the first beds 5a and 5b. It is movably mounted. Between the second bed 11 and the first beds 5a, 5b, screw shafts 13a, 13b connected to the gad motors 12a, 12b installed on the protruding portion 11a of the second bed 11 and driven to rotate are arranged. It This screw shaft 13a, 13b
Are engaged with nuts (not shown) that are rotatably mounted on the back surfaces of the first beds 5a and 5b, respectively.
By rotating a and 13b, the first beds 5a and 5b linearly move with respect to the screw shafts 13a and 13b. Thus, in this embodiment, the observation and measurement lance 3 and the refractory construction lance 4 are used.
However, both are linearly driven with respect to the second bed 11 in the axial direction of the screw shafts 13a and 13b. In the present embodiment, the stroke of this straight drive is 2800 mm.

The second bed 11 is transformed into a rectangular flat plate-shaped third bed 17 through a shaft supporting portion 15 connected to a substantially central portion of the back surface in the longitudinal direction and a tilting motor cylinder 16 connected to an end portion of the back surface. It will be installed. By operating the tilting motor cylinder 16, the second bed 11 is moved with respect to the third bed 17.
It can tilt in the range of 12.0 to 32.0 °. Thus, in the present embodiment, the observation and measurement lance 3 has the tap hole 2a.
The refractory construction lance 4 can be moved and inserted into the tapped hole 2a with the same movement locus as that when moved / inserted into.

A projecting portion 17 formed at the end of the third bed 17
A turning motor cylinder 18 is installed at a. The swiveling motor cylinder 18 is installed in a rectangular flat plate-shaped fourth bed 19 on which the third bed 17 is mounted so as to be rotatable about a fulcrum D. By driving the turning motor cylinder 18, the third bed 17 can turn left and right within a range of ± 10.0 ° with respect to the fulcrum D of the fourth bed 19. In this way, in this embodiment, the observation and measurement lance 3 and the refractory construction lance 4 are both adjusted in right and left angles of the lance axis.

A rack 20a is installed on the back surface of the fourth bed 19 in a direction orthogonal to the longitudinal direction.
A traverse gad motor 20 that drives a pinion gear 20b that meshes with the gear 20a is fixed to a fifth bed 21 having a rectangular flat plate shape.
By driving the traverse gad motor 20, the fourth bed 19 can traverse the fifth bed 21 in a direction perpendicular to the central axis of the tapped hole 2a in a horizontal plane with a stroke of 250 mm. In this way, the observation and measurement lance 3 and the refractory construction lance 4 both traverse the central axis of the tapped hole 2a.

Four jacks 22a to 22d are installed at the four corners on the back surface of the fifth bed 21, and the jacks 22a to 22d are provided.
Is placed on the repair device cart 24. Jacks 22a-22d
Is controlled by a geared motor 23 to move the fifth bed 21 up and down with respect to the repair device carriage 24 with a stroke of 250 mm.

The repairing device carriage 24 is a channel structure having the appearance of a box-shaped mount of 3.5 m × 2.5 m × 0.4 m. Traveling is performed by remote control by manual operation, and it is possible to travel in a direction parallel to the central axis of the tapped hole 2a in a horizontal plane.
Stoppers 25a to 25d are arranged at the four corners of the repairing device carriage 24, hooked by a hacker 2c on a hook 2b fixed immediately before the converter 2 and fixed immediately before the tapped hole 2a by hydraulic pressure.

In the tap hole repairing apparatus 1 of the present embodiment, the lance rotating mechanism by the gad motors 8a, 8b, the lance straight moving mechanism by the gad motors 12a, 12b, the lance tilting mechanism by the tilting motor cylinder 16, and the lance turning by the turning motor cylinder 18 are used. Mechanism, traverse gad motor 20
The lance traverse mechanism by the lance, the lance lifting mechanism by the jacks 22a to 22d, and the traveling mechanism by the repair device carriage 24.

Further, in the present embodiment, the control device 27 controls the gad motors 8a, 8b, the gad motors 12a, 12b, the tilting motor cylinder 16, the turning motor cylinder 18, the traverse gad motor 20, the jacks 22a to 22d, and the repair device cart. Control signals are output to 24, respectively, and the observation and measurement lance 3 and the refractory construction lance 4 can be moved to any position and angle with a high degree of freedom. Therefore, both the observation and measurement lance 3 and the refractory construction lance 4 can be inserted and withdrawn at desired positions and angles inside the tapped hole 2a.

The control device 27 in this embodiment controls the drive of the lance drive mechanism 26 and the repair device carriage 24 described above, stores the movement locus of the observation and measurement lance 3, and controls the refractory construction lance 4 based on this movement locus. The movement control and the confirmation of the coincidence between the axis of the refractory construction lance 4 and the center axis of the tapped hole 2a are controlled in an integrated manner, and the burner 30 attached to the tip of the refractory construction lance 4 is controlled. Sprayed raw material powder
Supply / stop 36a, combustion oxygen gas 36b, and fuel gas.

As a result, the tap hole repairing apparatus 1 as a whole can be easily automated or operated remotely.

Next, the repair of refractories using the tap hole repairing apparatus 1 of this embodiment will be explained step by step. In addition,
The following explanation will be given by taking as an example the case where it is applied when the converter is not in operation (when tilting after tapping).

When the operation in the converter has a sufficient time, the operator can operate the lance drive mechanism 26 of the tap hole repairing apparatus 1 immediately after the steel is turned over after the tapping and is in an empty kiln, so that the fire resistance can be improved. The observation and measurement lance 3 having the same outer diameter as the construction lance 4 is inserted into the tapped hole 2a, the lance drive mechanism 26 is finely adjusted, and the inner wall surface is photographed by the ITV camera eye 9 at the same time. Receive on monitor TV. During this charging, the shaft center of the observation and measurement lance 3 is tapped
Align with the central axis of 2a.

When inserting the tapped hole 2a into the inside,
Laser light emitted from a distance measuring laser irradiation device (not shown) attached to the tip of the observation measurement lance 3 by receiving an image from the ITV camera eye 9 that has photographed the inner wall surface of the tap hole 2a on the monitor TV. Confirm the standard position on the screen of the monitor TV by observing spots. In this way, the tap hole is tapped from the original position (standby position).
The movement locus of the observation and measurement lance 3 up to 2a is made into a function, and the functioned movement locus is stored in the control device 27.

Further, the operator visually confirms the image on the monitor television to confirm the repair required repair range.

Then, by driving the gad motor 12a, the observation and measurement lance 3 is moved backward to pull out from the tapped hole 2a and return to the standby position.

Next, the traverse gad motor 20 is driven to traverse the refractory construction lance 4 to a position corresponding to the standby position. Then, the control device 27 controls the lance drive mechanism so that the refractory construction lance 4 follows the stored movement trajectory.
The control signal is output to 26. As a result, the refractory construction lance 4 draws the same movement locus as the observation measurement lance 3 at the same position inside the tap hole 2a (the axis of the refractory construction lance 4 is the central axis of the tap hole 2a). (The position that matches). In this way, the refractory construction lance 4 is inserted with its axial center aligned with the central axis of the tapped hole 2a. In the present embodiment, the axis of the refractory construction lance 4 is made to coincide with the axis of the tapped hole 2a so that the inner wall surface of the tapped hole 2a arranged substantially horizontally as shown in FIG. This is for repairing to a uniform thickness.

After that, the refractory construction lance 4 is rotated with respect to the central axis and moved forward and backward in the repair required range determined based on the damage condition of the tapped hole 2a observed by the observation and measurement lance 3. Meanwhile, repairing by thermal spraying is performed so that the inner wall surface of the tapped hole 2a has a uniform thickness.

To repair the refractory material, a burner 30 mounted on the tip of the refractory construction lance 4 ejects a flame for spraying and a spraying raw material powder 36a consisting of a basic refractory material for repair into the steel hole 2a. Then, the thermal spraying is performed.

At the time of this thermal spraying, since the inner wall surface of the tapped hole 2a is as small as about 200 to 320 mm as described above, the spraying distance must be reduced, but as described above, the burner 30 used in this embodiment is used. Since the spraying distance is short, the inner wall surface of the tapped hole 2a can be reliably repaired by spraying.

FIG. 6 is an explanatory view conceptually showing a situation in which a basic refractory material is sprayed on a horizontal repair surface.
6A shows the case of the burner 30 used in this embodiment, and FIG. 6B shows the case of the conventional burner 40. 7 (a) and 7 (b) show the sprayed coating formed by stacking the repair surface composed of the inner wall surface of the vertical cylinder and the repair surface composed of the inner wall surface of the horizontal cylinder by the burner 30 used in the present embodiment. It is a figure.

In order to perform the thermal spray repair of the basic refractory with the burner 30 used in this embodiment, the following operation is performed.

When spraying the sprayed raw material powder 36a toward the repair surface 42 while rotating the refractory construction lance 4 around its axis, the hopper 40a in FIG. 5 is opened and the hopper 40b in FIG. From the body supply system 36, a mixed powder of the thermal spray raw material powder 36a and the combustion metal powder 36b is ejected.

Here, in the conventional burner 40, as shown in FIG.
As shown in, since the tip portion thereof is directed in a direction orthogonal to the repair surface 42, particularly in repairing the tapping hole 2a having a small spray distance, rebounds are all splashes to reduce the adhesion efficiency, and The tip of the burner 40 may be melted. On the other hand, the burner 30 used in the present embodiment, as described above, has its tip bent at the inclination angle θ, so that the surface of the repair surface 42 can be formed with the airflow irradiation that is easy to maintain the directionality. You can The air flow that is formed suppresses the occurrence of splash, and the spray coating
As shown in FIG. 6A, 43 is formed by stacking in a corrugated cross section.

The sprayed coating 43 piled up on the surface of the repair surface 42 is a so-called molten pool having a low viscosity, and if it is dropped, the adhesion efficiency may be lowered. Therefore, whether the repair surface 42 is a vertical surface or a horizontal surface affects the adhesion efficiency.

Therefore, in order to maintain both the spray deposition rate and the splash suppression, as shown in FIG. 7A, a cylindrical wall surface such as the tap hole 2a of the converter 2 shown in this embodiment is used. Is installed almost horizontally, the tilt angle θ is 60
It is desirable to bend the tip of the burner 30 so that the angle becomes ~ 80 °. As shown in Fig. 7 (b), when the cylindrical wall surface is installed almost vertically like the tap hole of the RH degassing furnace. In addition, it is desirable to bend the tip of the burner 30 so that the inclination angle θ is 30 to 50 °.

In the description of the present embodiment, as shown in FIGS. 7 (a) and 7 (b), the refractory construction lance 4 is inserted parallel to the central axis of the tapped hole 2a, and refractory construction is performed. A desired inclination angle θ is obtained by inclining the tip of the burner 30 provided in parallel with the axis of the lance 4, but in the implementation,
The bending of the tip of the burner 30 is constant at an arbitrary angle, and the bending of the tip of the burner 30 and the refractory construction are performed by inserting the refractory construction lance 4 with the axis of the refractory construction lance 4 inclined with respect to the center axis of the tapped hole 2a. Along with the inclination of the lance 4, the desired inclination angle θ
May be obtained.

When the thermal spraying is carried out in this manner, the thermal sprayed film remelts when the thickness of the thermal sprayed film exceeds a critical value (10 mm in the present embodiment) due to the thickness of the thermal sprayed film piled up. Then the splash starts to occur. Therefore, it becomes impossible to stack the thermal spray coating to a thickness of more than 10 mm. Therefore, in the present embodiment, when the thickness of the thermal spray coating approaches the critical value, the hopper 40a in FIG. 5 is closed and the hopper 40b is opened, so that only the thermal spray raw material powder 36a is supplied from the second powder supply system 36. The ejection and the supply of the burning metal powder 36b are stopped.

As a result, excessive temperature rise and low viscosity of the sprayed coating are suppressed, so that it is possible to form the sprayed coating thicker than the above-mentioned critical value without causing splash. Although there is concern that the spraying temperature may decrease with the stop of the supply of the combustion metal powder 36b,
The circumferential length of the repair surface 42 of 2a is short, and the ambient temperature rises rapidly to easily maintain the desired flame temperature. Therefore, even if the supply of the combustion metal powder 36b is temporarily stopped,
The thermal spray coating can be laminated without lowering the thermal spray temperature.

Then, at an appropriate timing, the hopper 40
Second by opening a and closing hopper 40b
From the powder supply system 36, the thermal spray raw material powder 36a and the combustion metal powder 36b are supplied. Hereinafter, by repeating such operations, the sprayed powder is sprayed while suppressing the generation of splash by alternately ejecting the mixed powder of the sprayed powder 36a and the combustion metal powder 36b and the sprayed powder 36a. 42 can be made thicker.

In the burner 30 used in this embodiment, the thermal spray raw material powder 36a and the combustion oxygen gas are separated into separate fluid ejection ports 31a,
Since they are jetted from 32a and 33a, the mixing property of the both is low immediately after the jetting, but the mixing property increases due to the ejector effect as they come closer to the repair surface 42. However, the closer to the repair surface 42, the more the combustion of the combustion metal powder 36b progresses and the more the amount of air entrained from the surroundings increases, so the spraying efficiency rather decreases. Therefore, the burner 30 used in this embodiment has an optimum spraying distance. According to the confirmation of the present inventors, this optimum spraying distance is equal to the outer diameter of the burner 30.
It is in the range of 1.5 to 8 times.

After the repair by spraying is completed, by appropriately controlling the lance drive mechanism 26 of the tap hole repairing device 1,
The refractory construction work is completed by pulling out the refractory construction lance 4 from the tapped hole 2a and returning the repair device cart 24 to a predetermined position.

When the refractory material in the tap hole 2a is sprayed by the tap hole repairing apparatus 1 of the present embodiment, the outer diameter of the refractory construction lance 4 is such that mixed powder, combustion oxygen gas, fuel gas and It is at least 120 mm from the viewpoints of being able to supply an appropriate amount of cooling water, increasing the wall thickness to reduce the amount of bending of the refractory construction lance 4 and strengthening cooling capacity, and adding distance restrictions for thermal spraying. Therefore, the tap hole repairing apparatus 1 according to the present embodiment has a tap hole having an inner diameter of about 200 to 320 mm.
It is a highly practical device that is extremely suitable for the thermal spray repair of 2a.

As described above, according to the tap hole repairing apparatus 1 of the present embodiment, by inserting the observation and measurement lance 3 into the tap hole 2a, the position of the tap hole 2a and the damage state of the inner wall surface are examined. Can be easily and reliably observed and measured. Furthermore, based on this observation result, the required repair range on the inner wall surface of the tap hole 2a can be determined, and the refractory construction lance 4 can be accurately positioned at the center position of the tap hole 2a based on the determined required repair range. By inserting the refractory while inserting it and rotating it, the tapped hole 2a can be repaired efficiently and easily.

(Modifications) The above description of the embodiment has been made with reference to the case where the converter is not blown, but the tap hole repairing apparatus and tap hole repairing method for a molten metal container according to the present invention are as follows. The present invention is not limited to the embodiment, and can be applied even when the converter is blown.

FIG. 8 is a conceptual diagram showing a situation in which the tapping hole 50a is being sprayed and repaired during the blowing of the converter 50.

In FIG. 8, the repair work is started immediately after the blowing of the converter 50 is started. The repair procedure, construction conditions, etc. may be the same as in the case of non-blown converter. In the example shown in FIG. 8, the structure of the repairing device carriage 24 is improved together, and the repairing device carriage 24 is movable on a rail 51 laid above the converter 50 in an upright state. Mounted and fixed on. Then, by moving the moving gondola 52, moving it toward and approaching the upright converter 50, and slightly driving the refractory construction lance 4 by the lance drive mechanism 26, the shaft of the refractory construction lance 4 and the tapped steel The axis of the hole 50a can be easily aligned. As a result, the time required for the repair preparation can be further reduced, and even during the blowing of the converter 50, the thermal spray repair can be performed securely and reliably by remote control. As shown in FIG. 8, a heat insulating plate 54 is installed at the end of the hearth deck 53 to protect the moving gondola 52 and the rail 51.

In the above description of the embodiment, the converter is taken as an example to which the invention is applied, but the tap hole repairing apparatus and tap hole repairing method for a molten metal container according to the present invention is limited to such a mode. However, the present invention is equally applicable to other molten metal storage containers other than the converter, such as an RH degassing furnace. That is, even in the case of the RH degassing furnace, repair work can be performed in the operation gap. The inner diameter of the tap hole of the RH degassing furnace is 500 to 800 mm, and it is oriented in a substantially vertical direction. In order to quickly repair the inner wall surface of such tap hole to a uniform thickness, insert the refractory construction lance so that the axis of the refractory construction lance matches the axis of the tap hole. By turning the construction lance around the axis and moving it forward and backward with respect to the tap hole,
A refractory material may be applied to the inner wall surface of the tap hole by thermal spraying.

When the tapped hole is sprayed and repaired in the operation gap of the RH degassing furnace, the circumference of the tapped hole is long, and therefore the ambient temperature rises slowly. Therefore, the splash starts to occur only when the number of times the thermal spray coating is laminated is 3 or more. Therefore, the supply of the combustion metal powder from the second supply system may be stopped at this point.

In the above description of the embodiment, the imaging device is provided at the tip of the observation and measurement lance. However, if the device is capable of observing and measuring the position of the tap hole and the damage condition of the inner wall surface, the imaging device Other devices than the device may be used. For example, a well-known ultrasonic probe, a laser profiler, etc. can be illustrated.

Furthermore, the lance drive mechanism in the above embodiments is merely an example, and the tap hole repairing device for a molten metal container according to the present invention is not limited to this mode. The mechanism is not limited to a specific mechanism as long as it is a lance driving mechanism that can carry out desired driving by mounting an observation measurement lance and a refractory construction lance.

[0111]

The invention will now be described in more detail with reference to data.

(First Embodiment) Using the tap hole repairing apparatus 1 shown in FIGS. 1 to 3 equipped with the burner 30 shown in FIG.
The tap hole 2a of the ton converter 2 was repaired.

That is, low carbon steel was tapped at a tapping temperature of 1650 ° C., the residual slag was discharged, and then the furnace body was substantially inverted to repair the damaged portion of the inner wall surface of the tapped hole 2a. At this time,
The internal temperature of the tapped hole 2a was 1185 ° C. on average.

In this embodiment, the observation and measurement lance 3 is used as a tap hole.
By inserting into the inside of 2a, the repair required area
"Inner wall in the range of 750 to 1500 mm". Further, since the spraying width of the sprayed raw material powder 36a by the burner 30 mounted on the refractory construction lance 4 is about 60 mm, the tip of the refractory construction lance 4 reaches the position 750 mm inside the furnace inside the tap hole 2a. After that, the refractory construction lance 4 was pulled back at intervals of 50 mm, repeated 360 ° rotation and reversal, and forward and backward movements were repeated to form a sprayed coating having a thickness of 35 mm. The conditions for applying the thermal spray coating are as listed below. (Construction conditions) Spraying raw material powder: Magnesia 30% grade spinel, powder particle size:
0.1 to 1.0mm Metal powder for combustion: Mixing ratio in Ca-Si powder hopper 40b: Magnesia 30% grade spinel (85wt%), CaSi powder (9.5wt%) Powder supply rate: 55kg / h Powder carrier gas: Lpg (6.5Nm ³ / h) + Nitrogen gas (15Nm ³ / h) Combustion oxygen gas: 1st channel (25Nm ³ / h) + ^3rd channel (30Nm ³
/ h) Cooling water amount: 11Nm ³ / h (23 ℃) Spraying distance: 75-95mm Burner scanning speed: 1.2m / min After the refractory construction by spraying, the operation was restarted immediately,
The repaired part showed an average durability of 25 heat. On the other hand, in the conventional thermal spraying method, the tar pitch is changed in the MgO-O-C system.
An unshaped refractory made by mixing 20 wt% and kneading was applied, and the life was 5 heath at maximum.

(Second Embodiment) Using the tap hole repairing apparatus 1 shown in FIGS. 1 to 3 equipped with the burner 30 shown in FIG.
The inner wall surface of the tapping hole 2a of the ton converter 2 was repaired.

A low carbon steel is tapped at a tapping temperature of 1650 ° C.,
After discharging the residual slag, the furnace body is almost inverted and tapped
The damaged part of the inner wall surface of 2a was repaired. At this time, tapped hole
The internal temperature of 2a was 1250 ° C. on average.

In the present embodiment, the repair required range is set to "700
~ 1250mm range of the inner wall surface "was decided. Also burner
Since the spraying width of the sprayed raw material powder 36a by 30 is about 65 mm, the refractory construction lance 4 is inserted until the tip reaches the position of 700 mm inside the furnace inside the tap hole 2a, and then 60
Rotation and reversal of 360 ° were repeated while pulling back the lance 4 for refractory construction at mm intervals, and forward and backward movements were repeated to form a sprayed coating having a thickness of 20 to 30 mm. The conditions for applying the thermal spray coating are as listed below.

(Construction conditions) Spraying raw material powder: Alumina 40% grade spinel (85 wt%) + Si
Powder (15wt%) Spraying raw material powder particle size: 0.1-1.0mm Spraying raw material powder supply rate: 50kg / h Spraying raw material powder carrier gas: LPG (5Nm ³ / h) + nitrogen gas (15Nm ³
/ h) Oxygen gas for combustion: 1st channel (25Nm ³ / h) + ^3rd channel (30Nm ³
/ h) Cooling water volume: 11 Nm ³ / h (30 ° C) Spraying distance: 80-100 mm Burner scanning speed: 1.1 m / min After the refractory construction by spraying, the operation was restarted immediately,
The repaired part showed an average durability of 19 heat. On the other hand, in the conventional thermal spraying method, the tar pitch is changed in the MgO-O-C system.
An unstructured refractory made by mixing 20 wt% and kneading was applied.
It was about 4 heaths of life.

(Third Embodiment) As shown in FIG. 8 described above, the tapping hole 50 was repaired by thermal spraying when the converter 50 was blown. In this example, the thermal spray repair was carried out at the initial stage of blowing for 30 minutes, and the temperature of the inner wall surface at the time of repair was 690 to 870 ° C.
Further, at the time of repair, the tapped holes 50a having a length of 1250 mm were preliminarily equally divided into three sections, and 3 heat spraying was performed for each section. Then, the durability of the refractory constructed after the end of 3 heats was investigated.

As a result, a service life of 25 to 36 heat could be secured.

(Fourth Embodiment) As shown in FIG. 4, the inclination angle θ is 7
Using a burner 30 of 5 degrees, the spraying conditions were variously changed and the tapping holes of the RH degassing furnace were sprayed. This tapped hole is a vertical cylindrical wall (magchrome) with an inner diameter of 650 mm.
Thermal spraying was performed by heating to 00 ° C. The results are summarized in Table 1.

[0122]

[Table 1]

Samples No. 1 to No. 12 are samples of the present invention, and Samples No. 13 to No. 15 are comparative samples.

Samples No. 1 to No. 12 have a high adhesion rate, while Samples No. 13 to 15 all have a metal powder for combustion 36 after exceeding the splash generation limit film thickness.
Since the supply of b was not stopped, the adhesion rate decreased.

Further, in the example of the present invention, since the powder supply amount of the burner 30 has a margin, it is possible to easily increase the capacity and further increase the film thickness. Incidentally, at the time of thermal spraying in the present embodiment, the burner never flashback or clogging,
It was excellent in safety.

[0126]

As described in detail above, by the tap hole repairing apparatus and tap hole repairing method for a molten metal container according to the present invention, it is possible to quickly spray a melted portion of a basic refractory mainly by hot spraying. Can be repaired. Therefore,
In the case of a converter, not only during non-blowing but also during blowing,
By remotely operating the tap hole repair device, it became possible to reliably perform refractory construction on the inner wall surface of the tap hole.

The significance of the present invention having such an effect is extremely remarkable.

[Brief description of drawings]

FIG. 1 is a front view of a tap hole repair device 1 according to an embodiment.

FIG. 2 is a top view of the tap hole repairing device 1 of the embodiment.

FIG. 3 is a view taken along the line C-C in FIG.

FIG. 4 is a vertical sectional view showing a burner used in the embodiment.

FIG. 5 is an explanatory diagram schematically showing the overall configuration of the burner used in the embodiment.

FIG. 6 is an explanatory view conceptually showing a situation in which a basic refractory material is sprayed on a horizontal repair surface, and FIG. 6 (a) shows the case of the burner used in the embodiment, and FIG. 6 (b). Is the case with a conventional burner.

7 (a) and 7 (b) show a sprayed coating formed by stacking a repair surface composed of an inner wall surface of a vertical cylinder and a repair surface composed of an inner wall surface of a horizontal cylinder by a burner used in the present embodiment. FIG.

FIG. 8 is a conceptual diagram showing a situation in which a tapped hole is being repaired by thermal spraying at the time of blowing in a converter.

[Explanation of symbols]

1 Steel tap hole repair device 2 converter 2a tap hole 3 Observation measurement lance 4 Refractory construction lance 24 Lance drive mechanism 27 Controller

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiji Hiraoka 4-53, Kitahama, Chuo-ku, Osaka Sumitomo Metal Industries Co., Ltd. (56) Reference JP 5-112807 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C21C 5/46 103 F27D 3/14

Claims (3)

(57) [Claims] 1. An observation and measurement lance that is inserted into the center of the tap hole provided in the molten metal container to observe and measure the position of the tap hole and the damage condition of the inner surface, and the observation and lance inserted into the inside. A refractory construction lance for constructing a refractory on the inner surface, a lance drive mechanism for mounting the observation and measurement lance and the refractory construction lance, and the refractory based on a movement trajectory of the observation and measurement lance to the tap hole. A molten metal accommodating container tap hole repairing device, comprising: a control device that controls driving of a construction lance. 2. A first flow path, a second flow path, and a third flow path, which are formed independently from each other in the order from the central portion to the outside and have a fluid ejection port at each tip portion. The burner, the first supply system for supplying the first combustion oxygen gas to the first flow path, and the supply of the non-supply metal powder for combustion to the second flow path are freely switchable. A second supply system for supplying together with a sprayed raw material powder as a raw material and a fuel gas, and a third supply system for supplying a second combustion oxygen gas to the third flow path, and the second supply system A first powder feeder for supplying a mixed powder of the thermal spray raw material powder and the combustion metal powder, and a second powder feeder for supplying the thermal spray raw material powder, which are operated at different timings. An apparatus for repairing a tap hole of a molten metal container, which has. 3. On the repair surface of the tap hole of the molten metal container,
A molten metal container characterized in that a sprayed coating is piled up by alternately ejecting a mixed powder of a spraying raw material powder containing an aggregate as a main raw material and a combustion metal powder and the spraying raw material powder. Hot water hole repair method.