Specification
Title of invention Installation structure of tuyere
Technical field
0001
Background technology
0002 0003 0004 0005
Prior art literature
Patent documents
0006
Outline of the invention
Problems to be solved by the invention
0007 0008 0009 0010 0011
Means to solve problems
0012
The invention's effect
0013 0014
A brief description of the drawing
0015
Mode for carrying out the invention
0016 0017 0018 0019 0020 0021 0022 0023 0024 0025 0026 0027 0028 0029
Description of the sign
0030
The scope of the claims
1 2 3 4 5 6 7
Drawing
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Specification
Title of invention: Installation structure of tuyere
Technical field
[0001]
　The present invention relates to an installation structure of a tuyere installed so as to surround a nozzle or a plug for discharging molten metal downward from the bottom of a molten metal container.
Background technology
[0002]
　The nozzles installed at the bottom of the molten metal container to discharge the molten metal downward from the bottom of the molten metal container include a plate-shaped sliding nozzle device for controlling the flow rate of the molten metal, a dipping nozzle, and an upper nozzle. And so on.
[0003]
　For example, the upper plate for the sliding nozzle device is fixed to the iron skin at the bottom of the molten metal container, and the upper nozzle installed on the upper plate is one of the upper plate and the fireproof layer inside the iron skin at the bottom of the molten metal container. It is a part and is installed through a joint between the upper nozzle and the tuyere that comes into direct contact with it.
　The boundary between the lower end of the upper nozzle and the upper plate of such an installation structure is a structure in which they are in close contact with each other with a certain thickness, but the joints are separated during use and the interval is expanded. May create voids.
　Also, at the boundary between the upper nozzle and the tuyere, the joints at this boundary may be separated and the interval may be widened, creating a gap.
　When such a void is generated, the molten metal may invade the void, which may lead to a leakage accident of the molten metal.
[0004]
　In order to suppress the formation of voids at the boundary between the upper nozzle and the upper plate or tuyere, it has been attempted to take measures mainly for the upper nozzle.
　For example, Patent Document 1 states that "a hollow conical trapezoidal upper nozzle has a taper angle of less than 7 ° on the outer peripheral surface, and a molten metal holding container such as a tundish or a ladle is placed on the lower outer periphery of the upper nozzle located directly above the sliding gate. An upper nozzle for a sliding gate provided with a positioning protrusion for hooking on a lower outer wall or a refractory is disclosed (see the abstract of Patent Document 1).
Patent Document 2 states that "an upper nozzle 20 having a head-shaped conical shape and a cylindrical lower portion and having a nozzle hole for passing molten metal in the center in the axial direction, and the upper nozzle provided at the bottom of the molten metal container. In a casting nozzle structure in which 20 has a nozzle receiving brick to be inserted from below and a sliding flow rate control device (slide valve) 4 is arranged below the upper nozzle, the lower end of the upper nozzle 20 is provided. A nozzle structure for casting in which a concave portion 21 and / or a convex portion 24 is formed on an outer peripheral surface excluding the above is disclosed (see the abstract of Patent Document 2).
[0005]
　Similar to the above nozzle, a gap may be created between the tuyere and the iron skin even in a plug installed inside the tuyere for the purpose of blowing gas into the molten metal container or energizing, resulting in leakage of molten metal. There is a high risk of causing an accident.
Prior art literature
Patent documents
[0006]
Patent Document 1: JP-A-11-207457
Patent Document 2: JP-A-2002-35926
Outline of the invention
Problems to be solved by the invention
[0007]
　In Patent Document 1, the "positioning protrusion that hangs on the lower outer wall of the molten metal holding container or the refractory" prevents the upper nozzle itself from moving upward with respect to the iron skin of the molten metal container. be able to. However, the upper nozzle is not fixed to the tuyere and does not have the function of fixing the tuyere, so when the tuyere moves upward, the upper nozzle moves relative to the tuyere. It becomes possible, and the formation of voids between them is inevitable.
[0008]
　The mechanism of this void formation will be described with reference to FIG.
　As shown in the figure, in the conventional tuyere installation structure, the tuyere 2 is not directly fixed to the iron skin 4 at the bottom of the molten metal container. When the fireproof lining layer at the bottom of the molten metal container including the tuyere 2 moves from the iron skin 4 at the bottom of the molten metal container to the inside of the molten metal container, that is, upward due to heat or other causes, the tuyere 2 also interlocks with it. It easily moves inward (upward) of the molten metal container, and a gap 9 is formed between the molten metal container and the iron skin 4 at the bottom of the molten metal container.
　On the other hand, the upper nozzle 1 can move to and from the component 7 below it (here, the upper plate is taken as an example). That is, the upper nozzle 1 has a larger contact area with the tuyere 2 than the contact area with the lower component 7 (the area of ​​the joint portion), and the tuyere 2 has a slag or scale above the upper nozzle 1. Often infiltrates or reacts with to form a strongly integrated area. For these reasons, the upper nozzle 1 moves upward so as to move away from the lower component 7 and interlock with the tuyere 2, and a gap 6 is created between the upper nozzle 1 and the lower component 7.
　As another method, the present inventors applied a structure in which the upper nozzle is locked to the lower sliding nozzle device located outside the iron skin with a metal part. However, in this case, the upper nozzle rises together with the tuyere, the metal part is deformed, or the vicinity of the metal part of the upper nozzle is destroyed, and the generation of a gap between the upper nozzle and the upper plate is prevented. I couldn't.
[0009]
　In Patent Document 2, the upper nozzle does not move relatively with the mortar due to the concave or convex portion provided on the outer peripheral surface excluding the lower end of the upper nozzle, and the convex portion is provided and the convex portion is a tuyere. If it is in the form of biting into the inner surface, it is possible to prevent the upper nozzle from moving upward with respect to the tuyere. However, as in Patent Documents 1 and 5 described above, Patent Document 2 does not have a function of fixing the tuyere, so when the tuyere itself moves upward, the upper nozzle interlocks with the tuyere. It is inevitable that a gap will be formed between the plate and the like located below the upper nozzle.
[0010]
　The above-mentioned phenomenon may occur not only in the nozzle but also in the plug installed inside the tuyere as in the case of the above-mentioned nozzle for the purpose of blowing gas or energizing.
[0011]
　The problem to be solved by the present invention is located between the nozzle or plug installed at the bottom of the molten metal container and the plate or the like located below the nozzle or plug, and above or on the outer peripheral side of the nozzle or plug. The purpose is to provide a tuyere installation structure that does not create a gap between the tuyere and the tuyere.
　As a result, it is intended to prevent the occurrence of air entrainment from the voids and leakage of molten metal.
Means to solve problems
[0012]
　The present invention is the tuyere installation structure according to the following 1 to 7.
1. 1. It is a tuyere installation structure that is installed so as to surround a nozzle or plug that discharges molten metal downward from the bottom of the molten metal container, and the tuyere is attached to the iron skin at the bottom of the molten metal container by a joining part. Fixed tuyere installation structure.
2. The joint portion of the joint part with the iron skin is one or more of a welded structure, a screwed structure of screws, and a contact structure of a hole penetrating the iron skin around the outer hole of the iron skin. , The tuyere installation structure according to 1 above.
3. 3. The tuyere according to 1 or 2 above, wherein at least a part of the portion where the joint part contacts the tuyere is interposed through a metal plate or a metal case, or a sheet containing an inorganic material or carbon as a main component. Installation structure.
4. The joint part is composed of a plurality of independent parts, and the plurality of independent parts can be integrated and re-separated by any one or more of a screw screw structure, a hook structure, a fitting structure, a slide structure, and a bionette structure. The tuyere installation structure according to any one of 1 to 3 above, wherein the tuyere and the iron skin are joined to each other as possible.
5. The tuyere installation structure according to any one of 1 to 4 above, wherein the joint portions formed by the joint parts are dispersed in at least two places so as to uniformly divide the outer circumference of the tuyere.
6. The tuyere installation structure according to any one of 1 to 5 above, wherein at least a part of the joint parts is covered so as not to be exposed to the outside.
7. The tuyere installation structure according to any one of 1 to 6 above, wherein an amorphous refractory is installed above or at least a part of the periphery of the joint.
The invention's effect
[0013]
　In particular, it is installed around the tuyere as a general conventional technique, which causes many of the movement of the tuyere to the inside (upward) of the molten metal container and the generation of voids between the tuyere and the iron skin. In contrast to the fixing method in which the tuyere is sandwiched between the fireproof material layers, the present invention does not have a structure in which the tuyere is sandwiched between the fireproof material layers installed around the tuyere, but the tuyere is made of molten metal by joining parts. Since it is fixed to the iron skin at the bottom of the container, the tuyere does not move to the inside of the molten metal container in conjunction with the behavior of the refractory material layer installed around the tuyere.
　Therefore, the nozzles such as the upper nozzle or the plug installed on the inner hole side of the tuyere do not move upward from the upper plate installed below the nozzle or the fixing means with the outside of the iron skin, and these mutually. It is possible to prevent the formation of voids between the nozzles, or to prevent air from being caught in the nozzle inner hole and accidental leakage of molten metal.
[0014]
　Further, according to the present invention, it is not necessary to weld an iron joint part to the iron skin of a molten metal container, or even when welding, it is not necessary to repeat welding, and the number of times can be minimized. It is possible to significantly suppress or prevent deterioration of the skin and avoid the risk of damage / destruction of the iron skin, and also contribute to shortening the maintenance time and process required for welding and dismantling, and reducing costs.
A brief description of the drawing
[0015]
FIG. 1 is an image view of a vertical cross section showing Embodiment 1 of the present invention.
FIG. 2 is an image view of a vertical cross section showing the second embodiment of the present invention.
FIG. 3 is an image view of a vertical cross section showing Embodiment 3 of the present invention.
FIG. 4 is an image view of a vertical cross section showing a modified example of the third embodiment of the present invention shown in FIG.
5A and 5B show the fourth embodiment of the present invention, in which FIG. 5A is an image diagram of a vertical cross section, and FIG.
6A and 6B show Embodiment 5 of the present invention, where FIG. 6A is a plan view (image) and FIG. 6B is an image view of a vertical cross section.
[Fig. 7] Same as above.
[Fig. 8] Same as above.
[Fig. 9] Same as above.
FIG. 10 is an image view of a vertical cross section showing Embodiment 5 of the present invention.
FIG. 11 is a plan view (image) of a main part showing the fifth embodiment of the present invention.
FIG. 12 is an image view of a vertical cross section of a main part showing the fifth embodiment of the present invention.
[Fig. 13] A plan view (image) showing an example of arrangement of a portion where a joint component is installed.
[Fig. 14] Same as above.
[Fig. 15] Same as above.
[Fig. 16] Same as above.
[Fig. 17] A vertical cross-sectional view (image) showing the structure when a problem occurs in the prior art, using the upper nozzle as an example.
Mode for carrying out the invention
[0016]
　Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
　The first embodiment will be described with reference to FIG.
　In the first embodiment, a laterally convex portion having a through hole is provided in a part of the tuyere 2, and the iron skin 4 at the bottom of the molten metal container is a hole threaded at a position corresponding to the through hole. (Hereinafter referred to as “screw hole”), the tuyere 2 is fixed to the iron skin 4 by a joint part (bolt) 3 having a screw structure that matches the through hole and the screw hole of the iron skin 4.
[0018]
　The second embodiment will be described with reference to FIG.
　In the second embodiment, at least a part of the tuyere 2 is provided with a portion that expands downward, and a metal joint part 3 (metal plate or metal case 12) having a through hole is provided as an enlarged portion of the tuyere 2. Is installed so as to be restrained (hooked) downward, the iron skin 4 at the bottom of the molten metal container is provided with a screw hole, and the tuyere 2 is a through hole of the joint part 3 (metal plate or metal case 12) and the iron. It is fixed to the iron skin 4 with a joint part (bolt) 3 that matches the screw hole of the skin 4.
　Further, in the second embodiment, the amorphous refractory material 11 to be installed after the tuyere installation and fixing is installed above or around the joint component 3.
[0019]
　The third embodiment will be described with reference to FIG.
　This embodiment 3 is based on the above-described first embodiment, and is a metal plate or metal between the joint part 3 and the tuyere 2, or between the joint part 3 and the tuyere 2, and between the joint part 3 and the iron skin 4. A case 12 or a sheet 13 containing an inorganic material or carbon as a main component is installed, and the tuyere 2 and the iron skin 4 are fixed by the joining component 3 via these.
[0020]
　In the metal plate or metal case 12, or the sheet 13 containing an inorganic material or carbon as a main component, the contact portion of the tuyere 2 with the joint part 3 or the iron skin 4 is relaxed by these inclusions such as local stress concentration. To prevent it from being destroyed.
　The material of the metal plate or the metal case 12 may be appropriately selected according to the temperature of the portion concerned during operation. The molten steel or hot metal container can be made of iron or stainless steel, which is common.
　The material of the sheet 13 containing an inorganic material or carbon as a main component may be appropriately selected according to the temperature of the portion concerned during operation. In molten steel or hot metal containers, it can be a sheet or the like made of a general biosoluble or so-called RCF inorganic material, or a material containing carbon as a main component such as graphite or carbon-based fiber.
[0021]
　The metal plate or metal case 12 or the sheet 13 containing an inorganic material or carbon as a main component may surround a part of the tuyere or may be sandwiched in the middle like a washer. Further, as shown in FIG. 4, a wide range including a portion of the tuyere 2 that comes into contact with the joining component 3 may be covered with the metal case 12, and a part of the metal case 12 may be joined to the joining component 3.
[0022]
　The fourth embodiment will be described with reference to FIG.
　In the fourth embodiment, based on the first embodiment described above, a covering component 14 is installed in a portion corresponding to the screw head of the joint component 3 so that at least a part of the screw head is not exposed to the outside. ..
　In the fourth embodiment as well, as in the second embodiment of FIG. 2, an amorphous refractory can be installed above or around the joint portion of the tuyere 2 by on-site construction after the tuyere is installed and fixed. This has the advantage that a refractory layer above or around the tuyere at the bottom of the molten metal container can be formed without gaps.
　A cover such as the covering part 14 described above has a gap in the fireproof material to be constructed around a portion that supports and operates the joint part 3 such as a screw head, especially when the amorphous refractory material as described above is constructed. It is installed to prevent it from being directly filled and fixed without making disassembly difficult. At this time, as shown in FIG. 5B, it is also possible to form a recess at the upper end of the through hole portion where the joint part 3 is installed, such as the tuyere 2 and the iron skin 4, to surround the entire head of the joint part.
[0023]
　The fifth embodiment will be described with reference to FIGS. 6 to 12.
　In the fifth embodiment, at least a part of the tuyere 2 is provided with a portion that expands downward, and the iron skin 4 is provided with a joint component 3 formed so as to match the outer shape of the enlarged portion of the tuyere 2. Installed integrally or divided at a plurality of locations with a gap open in at least one direction of the region corresponding to the outer circumference of the tuyere 2 so that at least the tuyere 2 is closely attached and mounted between them. Has been done. Then, in the fifth embodiment, the enlarged portion of the tuyere 2 is slid and fitted in the gap of the joint part 3 to fix the tuyere 2.
[0024]
　The joint part 3 has a welded structure (FIG. 6), a screwed structure of screws (FIGS. 7, 8, and 9), or a hole penetrating the iron skin around the outer hole of the iron skin. One or more of the contact structure with the iron skin (that is, the contact structure with so-called rivets or bolts / nuts installed in the holes penetrating from the outer surface side to the inner surface side of the molten metal container of the iron skin, FIG. 10) is appropriately selected. be able to.
　The structure of rivets or bolts / nuts in this penetration type is not limited to the fifth embodiment, and can be applied to each of the above-described embodiments.
[0025]
　The tuyere 2 may be provided with a metal plate, a metal case, the above-mentioned sheet, or the like. In this case, as shown in FIG. 7, a wedge 3W may be attached between the joint part 3 and the enlarged portion of the tuyere to strengthen the fixing.
[0026]
　In the fifth embodiment, the tuyere 2 has a cylindrical shape, at least a part below the tuyere 2 is provided with the same expanding portion, and the rear tuyere 2 is rotated by arranging the enlarged portion between the joint parts 3. It is also possible to fit the tuyere to the joint part 3 (so-called bionet structure, FIG. 8).
[0027]
　In the slide mounting method, the rotary mounting method, or the like, the tuyere 2 can be mounted with the holder 3H as an independent component between the tuyere 2 and the joint component 3 (FIG. 9). The holder 3H is provided with a convex portion 3HC at least at a portion to be joined to the joint component 3, and the convex portion 3HC is attached to the joint component 3 by sliding or rotation and fixed (FIGS. 11 and 12). In particular, the strength of gradual fixing can be increased by reducing the space between the joint component 3 and the convex portion 3HC or reducing the thickness of the convex portion 3HC in the mounting direction. Further, at the time of disassembly, the tuyere 2 can be easily removed by sliding or rotating in the opposite direction.
　It should be noted that such a form using the holder 3H or the like can be applied not only to the slide method and the bionet method.
[0028]
　13 to 16 show an example of arrangement of a portion where the joint component 3 is installed. As described above, it is preferable that the joint parts 3 (joint portions formed by the joint parts 3) are dispersed in at least two places so as to uniformly divide the outer periphery of the tuyere 2.
[0029]
　The iron skin of the molten metal container is basically used repeatedly for a long period of time, and its deterioration should be avoided. Repeated welding is not preferable because it may cause serious damage such as deterioration of the iron skin, cracking or breaking. In addition, it takes a lot of labor, time, cost, etc. to repeat the dismantling and welding work, which is not preferable from the viewpoint of productivity and cost.
　Therefore, when a welded structure to the iron skin is included, it can be attached to and detached from the tuyere such as a screw structure, a hook structure, a slide structure, and a bionette structure as described above so as not to repeat welding and disassembly. It is preferable to combine fixing with parts.
Description of the sign
[0030]
　1 Upper nozzle
　2 Tuft
　3 Joint part
　3F Joint part with iron skin of joint part
　3H One part of the joint part (example of holder placed in the middle)
　3HC Convex part of holder in the example of the holder
　One of the 3W joint parts (example of a wedge placed in the middle)
　4 Iron skin at the bottom of the molten metal container
　5 Joint between the upper nozzle and the tuyere
　6 Between the upper nozzle and the lower nozzle (plate in this case) Joint part
　6S Thickness when a gap is generated in the above 6
　7 Lower nozzle
　8 Inner hole
　9
　Void formed between the tuyere and the iron skin at the bottom of the molten metal container 9S Thickness
　10 of the above 9 Refractory Layer (periphery of tuyere (peripheral part))
　11 Amorphous refractory layer (periphery of tuyere (peripheral part))
　12 Metal plate or metal case
　13 Sheet material
　14 Covering part of joint parts
The scope of the claims
[Claim 1]
　It is a tuyere installation structure that is installed so as to surround a nozzle or plug that discharges molten metal downward from the bottom of the molten metal container, and the tuyere is attached to the iron skin at the bottom of the molten metal container by a joining part. Fixed tuyere installation structure.
[Claim 2]
　The joint portion of the joint part with the iron skin is one or more of a welded structure, a screwed structure of screws, and a contact structure of a hole penetrating the iron skin around the outer hole of the iron skin. , The tuyere installation structure according to claim 1.
[Claim 3]
　The feather according to claim 1 or 2, wherein at least a part of the portion where the joint part contacts the tuyere is interposed through a metal plate or a metal case, or a sheet containing an inorganic material or carbon as a main component. Mouth installation structure.
[Claim 4]
　The joint part is composed of a plurality of independent parts, and the plurality of independent parts can be integrated and re-separated by any one or more of a screw screw structure, a hook structure, a fitting structure, a slide structure or a bionette structure. The tuyere installation structure according to any one of claims 1 to 3, wherein the tuyere and the iron skin are joined to each other as possible.
[Claim 5]
　The tuyere installation structure according to any one of claims 1 to 4, wherein the joint portions formed by the joint parts are dispersed in at least two locations so as to uniformly divide the outer circumference of the tuyere.
[Claim 6]
　The tuyere installation structure according to any one of claims 1 to 5, wherein at least a part of the joint parts is covered so as not to be exposed to the outside.
[Claim 7]
　The tuyere installation structure according to any one of claims 1 to 6, wherein an amorphous refractory is installed above or at least a part around the joint part.