JP2995041B2 - Support device for tilting metallurgical furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supporting a tilting metallurgical furnace, such as a converter, used in a steelmaking process of steelmaking.

[0002]

2. Description of the Related Art In a steel making process, a converter 1 as shown in FIG. 6 is widely used in a steel making process. The furnace body of the converter 1 has an opening called a furnace port 3 at the top, and is used for charging a raw material for steelmaking and discharging slag generated in a refining process. A tapping hole 4 is provided in the abdomen of the furnace body 2,
Used to remove refined molten steel. When charging the raw material using the furnace port 3, discharging the slag, and removing molten steel using the tapping port 4, the furnace body 2 is tilted from an upright state. In order to make the furnace body 2 tiltable, the converter 1
It is supported so as to be rotatable around a trunnion shaft as an ear shaft provided in the upper half part of the camera.

FIG. 7 shows a structure in which a furnace body 2 of a converter 1 is supported by trunnion rings 5 and trunnion shafts 6 are provided on both sides of the trunnion rings 5.
The structure which provides is shown. In the converter 1 of such a trunnion ring type, since the trunnion shaft 6 and the trunnion ring 5 having strong rigidity support the furnace body 2 integrally, the tilted raw material including the static load of the furnace body 2 is obtained. Care must be taken to ensure that the dynamic load during charging, as well as the thermal distortion of the furnace body 2 caused by the periodic thermal history during the operation of the converter is not exerted on the mechanism that tilts the trunnion shaft 6. it can. The furnace body 2 of the converter 1 is supported on a trunnion ring 5 via a bracket 7. In order to support the furnace body 2,
Since the bracket 7 is required in addition to the rigid trunnion ring 5, the trunnion ring method has a complicated structure as a supporting device and is used for a large converter requiring a large strength. Prior art relating to cooling the furnace body 2 of the converter 1 using a support ring such as a trunnion ring 5 to prevent the strength of the trunnion shaft 6 from decreasing due to heat and reducing the diameter of the trunnion shaft is disclosed in Japanese Patent Laid-Open No. 9580
7 is disclosed. In this prior art, a cooling medium is caused to flow around a trunnion shaft, which is a support shaft, to prevent a decrease in strength due to a rise in temperature, thereby reducing the diameter of the support shaft.

If the trunnion shaft 6 is directly welded to the furnace body 2 of the converter 1 as shown in FIG. 8 without using the trunnion ring 5 as shown in FIG. 7, the weight of the converter 1 can be reduced. A hole for inserting the base of the trunnion shaft 6 is formed in an outer shell 8, which is an outer shell of the furnace body 2 and formed by welding a steel plate, and the trunnion shaft 6 for inserting the base in this hole is welded. You. A reinforcing ring 9 is provided on the outer peripheral side of the steel shell 8,
The penetrating part of the trunnion shaft 6 is fixed by welding.

[0005]

In the converter 1 in which the trunnion shaft 6 is directly welded to the steel shell 8 of the furnace body 2 as shown in FIG. 8, heat is transferred from the furnace body 2 to the trunnion shaft during operation. 6
Therefore, problems such as deformation of the trunnion shaft 6 occur. The problem of such deformation due to heat is disclosed in
As in the prior art of -95807, it is conceivable to flow the cooling medium of the converter 1 also around the trunnion shaft 6 to prevent the temperature of the trunnion shaft 6 from rising, but the configuration around the trunnion shaft 6 becomes complicated. Would.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tilting metallurgical furnace supporting apparatus which can prevent a rise in the temperature of a trunnion shaft with a simple structure.

[0007]

SUMMARY OF THE INVENTION The present invention provides a tilting metallurgical furnace supporting apparatus in which a trunnion shaft for tiltably supporting a furnace body of a metallurgical furnace is directly mounted on the furnace body. A block structure that is formed at the mounting portion of the furnace, the inner peripheral side is arranged at an interval radially outward from the steel shell of the furnace body, and holds the base end of the trunnion shaft, and is disposed above and below the block structure. The upper stiffening ring and the lower stiffening ring, which are annular and plate-shaped and whose inner peripheral side is fixed to the furnace shell by welding, and the upper stiffening ring and the lower stiffening ring, the outer periphery of the furnace body An inner stiffening plate that is supported radially outward from the surface steel and supports the base end of the trunnion shaft, and upper and lower stiffening rings Therefore, a block structure comprising: an outer reinforcing plate that is supported on the outer peripheral surface of the furnace body at a radially outer side than the inner reinforcing plate and that supports a portion outside the base end at the base of the trunnion shaft. And a water cooling tube mounted on a steel shell inside the block structure.

According to the present invention, since the block structure holds the trunnion shaft directly attached to the furnace body at an interval radially outward from the steel shell on the outer periphery of the furnace body, the trunnion shaft can be removed from the steel shell of the furnace body. It becomes difficult for heat to be transmitted to the base end of the trunnion shaft, and it is possible to prevent the temperature of the trunnion shaft from rising, thereby reducing deformation and the like. The block structure includes an inner reinforcing plate which is radially outwardly supported by an upper stiffening ring and a lower stiffening ring which are arranged vertically and spaced apart from a steel shell. Support the base end of the trunnion shaft with the inner reinforcing plate,
Since the outer portion of the base of the trunnion shaft beyond the base end is reinforced by the outer reinforcing plate, the trunnion shaft can be securely held. Since it is not necessary to form a trunnion ring separately from the furnace body, the configuration of the furnace body can be simplified and the weight can be reduced. A space can be left between the base end of the trunnion shaft and the steel shell. A water cooling tube is provided in this space, and the steel shell can be cooled by the water cooling tube, so the trunnion shaft is directly attached to the steel shell It is also possible to cool the portion of the steel shell that cannot be cooled by the conventional method, and to extend the life of the refractory brick inside the steel shell.

The present invention further provides a tilting metallurgical furnace supporting apparatus in which a trunnion shaft for tiltably supporting a furnace body of a metallurgical furnace is directly mounted on the furnace body, the trunnion shaft being formed on a mounting portion of the trunnion shaft on the outer peripheral side of the furnace body. The inner peripheral side is arranged at a distance radially outward from the steel shell of the furnace body, is a block structure that holds the base end of the trunnion shaft, is disposed above and below the block structure, annular and The upper stiffening ring and the lower stiffening ring, which are plate-shaped and whose inner peripheral side is welded and fixed to the steel shell of the furnace body, and the upper stiffening ring and the lower stiffening ring,
The inner periphery of the furnace body is supported by an inner reinforcing plate that supports the base end of the trunnion shaft and that is supported radially outward from the steel shell on the outer peripheral surface of the furnace body, and the upper and lower stiffening rings. A block structure comprising: an outer reinforcing plate that is supported at a distance radially outward from the inner reinforcing plate on the surface and supports a portion outside the base end at the base of the trunnion shaft; and An apparatus for supporting a tilting metallurgical furnace, comprising: an air-cooling tube mounted on an inner steel shell.

According to the present invention, the block structure holds the trunnion shaft directly attached to the furnace body at an interval radially outward from the steel shell on the outer periphery of the furnace body. It becomes difficult for heat to be transmitted to the base end of the trunnion shaft, and it is possible to prevent the temperature of the trunnion shaft from rising, thereby reducing deformation and the like. The block structure includes an inner reinforcing plate which is radially outwardly supported by an upper stiffening ring and a lower stiffening ring which are arranged vertically and spaced apart from a steel shell. Support the base end of the trunnion shaft with the inner reinforcing plate,
Since the outer portion of the base of the trunnion shaft beyond the base end is reinforced by the outer reinforcing plate, the trunnion shaft can be securely held. Since it is not necessary to form a trunnion ring separately from the furnace body, the configuration of the furnace body can be simplified and the weight can be reduced. A space can also be left between the base end of the trunnion shaft and the steel shell. An air cooling tube is provided in this space, and the steel shell can be cooled by the air cooling tube, so the trunnion shaft is directly attached to the steel shell It is also possible to cool the portion of the steel shell that cannot be cooled by the conventional method, and to extend the life of the refractory brick inside the steel shell.

[0011]

[0012]

[0013]

FIG. 1 shows an outline of a support structure according to an embodiment of the present invention. The block structure 10 is formed on the outer peripheral side of the furnace body at the mounting portion of the trunnion shaft, which is the converter ear shaft. The block structure 10 includes an upper stiffening ring 11 and a lower stiffening ring 12 which are horizontally and vertically spaced, an inner stiffening plate 13 and an outer stiffening plate 13 which are spaced apart on the outer peripheral side of the furnace body. The plate 14 is included. Each part of the block structure 10 includes a weld 15
Fixed at. The inner reinforcing plate 13 and the outer reinforcing plate 14 include
The base of the trunnion shaft 16 is inserted from the outside in the radial direction. The trunnion shaft 16 is provided in the inner reinforcing plate 13 and has a base end inserted into an insertion hole. The outer reinforcing plate 12 has a hole through which the trunnion shaft 16 is inserted. When the trunnion shaft 16 is inserted into the inner reinforcing plate 13 and the outer reinforcing plate 14,
The outer periphery of the base end side of the trunnion shaft 16 and the insertion holes of the inner reinforcing plate 13 and the outer reinforcing plate 14 are fixed by forming a welded portion 15. The inner reinforcing plate 13 and the outer reinforcing plate 14 are held between the upper upper stiffening ring 11 and the lower lower stiffening ring 12. Outer reinforcing plate 14
Are welded to the outermost peripheral side of the upper stiffening ring 11 and the lower stiffening ring 12. The inner reinforcing plate 13 is welded to an intermediate portion between the upper stiffening ring 11 and the lower stiffening ring 12. The lower side of the generally triangular reinforcing rib 17 is welded to the upper surface of the upper stiffening ring 11.

The left side of the reinforcing rib 17 in FIG. 1 and the inner peripheral sides of the upper stiffening ring 11 and the lower stiffening ring 12 are formed on the outer peripheral surface of a steel shell 18 which is the outer shell of the converter body. It is fixed by welding. Trunnion shaft 16
Is welded to an inner reinforcing plate 13 held at an intermediate portion by an upper stiffening ring 11 and a lower stiffening ring 12, so that the base end is spaced radially outward from a steel shell 18 of the furnace body. Will be held open.

Since there is a gap between the steel shell 18 and the base end of the trunnion shaft 16, the trunnion shaft is more rigid than the structure in which the base end of the trunnion shaft is directly welded to the steel shell as shown in FIG. The heat is hardly transmitted to 16. In the present embodiment, a water cooling pipe 19 is attached to the surface of the steel shell 18 to directly cool the steel shell 18. A refractory brick is adhered to the inside of the steel shell 18 in the radial direction. If the surface of the steel shell 18 is cooled, the life of the refractory brick can be extended.

FIG. 2 shows a cross section viewed from above the upper stiffening ring 11 of FIG. 1 and a cross section passing through the center of the trunnion shaft 16. The left portion is a cross section as viewed from above the upper stiffening ring 11, and the right portion is a cross section passing through the center of the trunnion shaft 16. FIG.
The inner reinforcing plate 13 and the outer reinforcing plate 14 are held between a pair of side reinforcing plates 22 and 23. Inner reinforcing plate 13
And the side end surfaces of the outer reinforcing plates 14 are side reinforcing plates 22 and 23.
The portion that is in contact with the inner surface of is fixed by welding.

FIG. 3 shows the trunnion shaft 1 of FIGS.
6 shows an outline of the block structure 10 viewed from the axial direction.
A vertical rib 24 is inserted between the outer peripheral surface of the trunnion shaft 16 and the upper and lower upper stiffening rings 11 and 12, and the end surface is welded. Further, the outer peripheral surface of the trunnion shaft 16 and the side reinforcing plate 2
The horizontal ribs 25 are also inserted between the first and second ribs 2 and 23, and are welded. With such a block structure 10, as shown in FIGS. 1 and 2, the base end of the trunnion shaft 16 can be attached away from the steel shell 18 where the trunnion shaft 16 is mounted.

As shown in FIG. 1, a gap can be provided between the trunnion shaft 16 and the base end thereof.
Can be cooled using a water cooling pipe 19. The water cooling pipe 19 is also conventionally used for the other parts of the furnace body, and the mounting part of the trunnion shaft 16 is similarly water-cooled, thereby uniformly cooling the whole as a whole.
Local thermal distortion and the like can also be prevented. The temperature of the refractory brick on the inner peripheral side of the steel shell 18 can also be reduced because the steel shell 18 is cooled, and the life can be extended.

FIG. 4 shows a converter 31 having the support structure of FIG.
Is shown as a whole. An upper stiffening ring 11 and a lower stiffening ring 12 are mounted around the furnace body 32 of the converter 31 over the entire circumference, and the base end of the trunnion shaft 16 is held at a portion where the block structure 10 is formed. Is done. Unlike the converter of the trunnion ring type, there is no need to form a trunnion ring separately from the furnace body of the converter, so that the configuration of the converter 31 can be simplified and reduced in weight.

FIG. 5 shows, as another embodiment of the present invention, a structure in which the iron shell 18 is cooled by an air cooling pipe 39 in the same block structure 10 as the embodiment of FIG. In the present embodiment, portions corresponding to the embodiment of FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted. In the air cooling pipe 39,
A jet nozzle 40 for jetting cooling air toward the steel shell 18 is provided. During the operation of the converter, the iron shell 18 can be cooled from the air cooling pipe 39 via the jet nozzle 40, and the life of the refractory brick inside the iron shell 18 can be extended.

[0021]

As described above, according to the present invention, the base end of the trunnion shaft is held radially outward from the metal shell of the metallurgical furnace to reduce the effect of heat transmitted to the trunnion shaft. Thus, deformation and the like can be prevented. Since it is also possible to cool the steel shell at the part where the trunnion shaft is installed, the temperature of the refractory brick attached to the inside of the steel shell to be cooled can be lowered, and the life of the brick can be extended. Become.
The cooling of the steel shell is performed by a water-cooled tube, and the deformation of the steel shell can be prevented by the same efficient water cooling as the other parts of the furnace body, and the life of the refractory brick can be extended.

According to the present invention, the base end of the trunnion shaft is held radially outward from the metal shell of the metallurgical furnace to reduce the influence of heat transmitted to the trunnion shaft to reduce deformation and the like. Can be prevented. Since it is also possible to cool the steel shell at the part where the trunnion shaft is installed, the temperature of the refractory brick attached to the inside of the steel shell to be cooled can be lowered, and the life of the brick can be extended. Become. Since the iron shell can be cooled with an air cooling tube, it prevents deformation of the iron shell,
The life of the refractory brick inside can be extended.

[0023]

[Brief description of the drawings]

FIG. 1 is a partial front sectional view of a block structure 10 according to an embodiment of the present invention.

FIG. 2 is a partial plan sectional view of the block structure 10 of FIG.

FIG. 3 is a partial side view of the block structure 10 of FIG.

FIG. 4 is a simplified front view of a converter 31 holding the trunnion shaft 16 by the block structure 10 of FIG.

FIG. 5 is a partial front sectional view showing a configuration for cooling an iron shell 18 with an air cooling pipe 39 in another embodiment of the present invention.

FIG. 6 is a side sectional view showing a schematic configuration of a general converter 1.

FIG. 7 is a simplified front view of a trunnion ring type converter.

FIG. 8 is a partial plan sectional view of a converter in which a trunnion shaft is a direct furnace body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Block structure 11 Upper stiffening ring 12 Lower stiffening ring 13 Inner reinforcing plate 14 Outer reinforcing plate 15 Welded part 16 Trunnion shaft 17 Reinforcing rib 18 Steel shell 19 Water cooling pipe 31 Converter 32 Furnace body 39 Air cooling pipe 40 Jet nozzle

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C21C 5/50 C21C 5/42 F27B 3/06

Claims (2)

(57) [Claims] 1. A tilting metallurgical furnace supporting device in which a trunnion shaft for tiltably supporting a furnace body of a metallurgical furnace is directly attached to the furnace body, wherein the trunnion shaft is formed at a mounting portion of the trunnion shaft on the outer peripheral side of the furnace body. A block structure in which the circumferential side is arranged radially outward from the steel shell of the furnace body and holds the base end of the trunnion shaft, and is disposed above and below the block structure, and has an annular and plate-like shape. ,
An upper stiffening ring and a lower stiffening ring, the inner circumference of which is welded and fixed to the steel shell of the furnace body, and an upper stiffening ring and a lower stiffening ring, which are radially outward from the steel shell on the outer peripheral surface of the furnace body. The inner stiffening plate, which is supported at an interval and supports the base end of the trunnion shaft, and the upper stiffening ring and the lower stiffening ring, radially outward from the inner stiffening plate on the outer peripheral surface of the furnace body A block structure including an outer reinforcing plate supported at an interval and supporting a portion outside the base end at the base of the trunnion shaft; and a water cooling tube provided on a steel shell inside the block structure. A supporting apparatus for a tilting metallurgical furnace. 2. A tilting metallurgical furnace supporting apparatus, wherein a trunnion shaft for tiltably supporting a furnace body of a metallurgical furnace is directly attached to the furnace body, wherein the trunnion shaft is formed at a mounting portion of the trunnion shaft on the outer peripheral side of the furnace body. A block structure in which the circumferential side is arranged radially outward from the steel shell of the furnace body and holds the base end of the trunnion shaft, and is disposed above and below the block structure, and has an annular and plate-like shape. ,
An upper stiffening ring and a lower stiffening ring, the inner circumference of which is welded and fixed to the steel shell of the furnace body, and an upper stiffening ring and a lower stiffening ring, which are radially outward from the steel shell on the outer peripheral surface of the furnace body. The inner stiffener plate, which is supported at an interval and supports the base end of the trunnion shaft, and the upper stiffening ring and the lower stiffening ring, on the outer peripheral surface of the furnace body, are more radially outward than the inner stiffener plate. A block structure having an outer reinforcing plate supported at an interval and supporting a portion outside the base end at the base of the trunnion shaft; and an air cooling tube mounted on a steel shell inside the block structure. A supporting apparatus for a tilting metallurgical furnace.