JP2995039B2 - Metal refining furnace bottom exchange equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for exchanging a bottom of a metal smelting furnace such as a converter for steelmaking.

[0002]

2. Description of the Related Art In a metal smelting furnace such as a converter for steelmaking, a molten metal of a high-temperature metal is stored inside. The furnace body of a metal smelting furnace is formed by lining a refractory brick with a lining inside a metal shell generally called an iron shell. As the operation continues in the metal smelting furnace, the refractory bricks are worn by the molten metal. When the thickness of the refractory lining decreases, the heat insulation effect is impaired, the surface temperature of the steel shell increases,
Eventually, the furnace body will be damaged. Therefore, in a metal smelting furnace, it is necessary to repair the refractory if it is damaged in order to maintain the thickness of the refractory lining at a certain value or more.

FIG. 7 shows a schematic configuration of a metal refining furnace such as a converter having a replaceable furnace bottom. The furnace bottom 2 of the furnace body 1 has a replaceable furnace bottom 3. The fixing of the furnace bottom 3 to the furnace bottom 2 is performed by using flanges 4a and 4b provided on the furnace body 1 and the furnace bottom 3, respectively.
Is fastened by bolts 5. Bolt 5
Is removed, the furnace bottom 3 can be extracted from the furnace bottom 2.

[0004] The furnace body 1 and the furnace bottom 3 are respectively constituted by an outer shell called iron shells 6a and 6b and refractories 7a and 7b lining the outer shells. Generally, the refractory 7b of the furnace bottom 3 is
The other part of the furnace body 1 is more damaged by the molten metal than the refractory 7a. The hearth-replaceable furnace body 1 is used to quickly replace the damaged refractory 7b of the hearth 3 with a new refractory. When repairing the refractories 7a and 7b of the furnace body 1,
Since the operation by the furnace body 1 must be stopped, the time required for repair is preferably as short as possible. Hearth 3
Is exchangeable, so that the furnace bottom 3 equipped with a new refractory 7b is separately prepared during the operation of the furnace body 1, and the refractory 7b of the furnace bottom 3 of the furnace body 1 in operation is prepared. If the damage increases, the furnace bottom 3 is replaced.

[0005] Prior art for replacement of the hearth 3 is disclosed, for example, in Japanese Patent No. 2561 registered on October 9, 1997.
No. 033 is disclosed in the Utility Model Registration Gazette. In this prior art, a work deck that can move up and down is provided on an upper surface of a truck that can run on a rail provided below a converter, and the angle and position of the furnace bottom are adjusted on the deck.

[0006]

A metallurgical furnace such as a converter having a replaceable furnace bottom as shown in FIG. 7 is provided with a metal fitting such as flanges 4a and 4b on a furnace body 1 and a furnace bottom 3. Each is attached and connected by bolts 5. In the furnace body 1 of such a type, it is necessary to perform centering within an allowable range of a dimension that can be fixed by a fastener.

In the prior art of Utility Model Publication No. 25661033, for centering, a member having a tapered hole at the center of the furnace bottom is attached, and inserted into the tapered hole on the lifting / lowering work deck 8 side. A furnace bottom support bracket for centering is provided. The hearth 3, especially the hearth 3 with the new refractory 7 b being heavy, has a considerable weight, and supports the weight of the hearth 3 on the lift-type work deck, while being relatively to the surface of the lift-type work deck. A large force is required to move the furnace bottom 3 and execute accurate centering. For this reason, the centering mechanism uses a hydraulic cylinder or an actuator based on another driving method, and moves the XY direction, the rotation direction, and the inclination of the horizontal plane separately to perform centering.
Such a centering method requires a large machine and is complicated. In addition, the centering work also takes time.

An object of the present invention is to provide a hearth replacement apparatus for a metal smelting furnace, which can reduce the size and simplification of a mechanism required for centering and facilitate the replacement operation. is there.

[0009]

SUMMARY OF THE INVENTION The present invention is capable of tilting with a shaft provided above the furnace bottom as a fulcrum, and fixing a mounting part formed on a replacement furnace bottom to a furnace body around the furnace bottom. A metal plate smelting furnace having a replaceable furnace bottom, the furnace bottom replacement device for replacing the furnace bottom, and a support plate for supporting the replacement furnace bottom on the upper surface; The supporting plate supporting the replacement furnace bottom is supported below the furnace bottom of the metal refining furnace, and the upper part of the replacement furnace bottom supported on the support plate upper surface is below the fixed part of the metal refining furnace. A support base having an elevating mechanism that is displaced up and down between a lowered position where it is lowered and a raised position where the replacement furnace bottom is inserted into the furnace bottom of the metal smelting furnace and the mounting part pushes up the support plate so that the mounting part is in close contact with the fixed part. And lift the support plate on the support so that the support plate can be displaced along the surface of the support A levitation mechanism, which is arranged at intervals along the lower surface of the support plate, the upper portion supports the lower surface of the support plate, the lower portion opens facing the surface of the support base, and is made of an elastic material. A hearth exchanging device for a metal smelting furnace, comprising: a plurality of formed bags; and a gas supply device for supplying a compressed gas into each of the bags.

According to the present invention, the replacement furnace bottom of the metal smelting furnace is supported on the upper surface of the support plate, and the lower surface of the support plate can be floated from the surface of the support base by the floating mechanism. It is possible to easily adjust the horizontal direction and the rotation direction necessary for centering the lens. If the support plate is lifted from the surface of the support base, the centering work can be performed quickly while moving the heavy replacement furnace bottom by hand, and the mechanism required to perform centering adjustment remotely. Can be omitted, and the apparatus can be simplified and downsized. In addition, a floating mechanism that supports the support plate on the surface of the support base includes a plurality of bags disposed at intervals along the lower surface of the support plate,
A gas supply device for supplying compressed gas into each bag.
Each bag is formed of an elastic material, the upper surface supports the lower surface of the support plate, and the lower portion is open facing the surface of the support base. When the compressed gas is supplied into each bag, the compressed gas flows out from the lower opening toward the surface of the support base, and a gas cushion is formed on the surface of the support base. The bag and the support plate float on a gas cushion formed on the surface of the support, and can easily move along the surface of the support. When the replacement furnace bottom supported on the upper surface of the support plate is inserted into the furnace bottom of the metal smelting furnace,
Depending on the positional shift and the angular shift between the furnace body and the replacement furnace bottom, they partially come into contact with each other and receive a reaction force from the contact portion. The bag body of the levitation mechanism is formed of an elastic material and has an open lower portion. It is not necessary to adjust the tilt direction, so that the centering operation can be speeded up, and the apparatus can be simplified and downsized. Also, with the replacement furnace bottom supported on the upper surface of the support plate on the support base, the upper part of the replacement furnace bottom is lowered below the fixing part provided around the furnace bottom of the furnace body, An elevating mechanism in which the furnace bottom is inserted into the furnace bottom of the metal refining furnace, and the mounting part formed on the replacement furnace bottom pushes up and down the support plate so as to push up the support plate so as to be in close contact with the fixed part of the furnace body. Is provided. When the support plate is lowered to the lowering position by the lifting mechanism, the replacement furnace bottom supported on the support plate is moved from a position immediately below the metal smelting furnace, and a new refractory prepared in advance in other parts. It is possible to easily carry in the work of carrying the replacement furnace bottom equipped with the smelting furnace directly below the furnace bottom of the metal smelting furnace. When a new replacement furnace bottom is inserted into the furnace bottom of the metal smelting furnace, the support plate is raised by the lifting mechanism. An adjustable bag for centering with a cushion of compressed air is provided as a floating mechanism between the support plate and the surface of the support base, so the replacement furnace bottom is raised while performing quick centering. And mounted on the furnace bottom of the furnace body. The metal smelting furnace, even if it is a converter that can be tilted about a shaft provided above the furnace bottom, can easily and quickly be replaced by a levitation mechanism that uses a gas cushion to absorb the inclination, etc. The bottom can be mounted on the bottom of the furnace body.

Further, in the present invention, the levitation mechanism includes a rubber bag as the bag body, supplies compressed air as the compressed gas from the gas supply device, and corrects misalignment and inclination at the time of centering. It is characterized by the following.

According to the present invention, in the levitation mechanism, compressed air can be supplied to the rubber bag and the support plate can be levitated by the cushion of compressed air, so that misalignment and inclination at the time of centering can be easily corrected. Can be done.

[0013]

[0014]

[0015]

FIG. 1 shows a schematic configuration of a hearth exchanging apparatus 10 according to an embodiment of the present invention. The furnace bottom 12 of the furnace body 11 of a metal smelting furnace such as a converter can be separated from the furnace bottom 13 and can be extracted downward and replaced with a new furnace bottom 13. Furnace bottom 13 of furnace body 11 has
A flange 14a which is a fixed portion around a portion where
Is formed. A flange 14b, which is a mounting portion, is also formed around the furnace bottom 13 at a position compatible with the flange 14a. If the flanges 14 a and 14 b are fastened with bolts 15, the furnace bottom 13 can be fixed to the furnace bottom 12 of the furnace body 11. The furnace body 11 and the furnace bottom 13 are made of steel shells 16a, 16
b as outer skins and refractories 17a and 17b as linings, respectively. Refractory 17a, 17
b is configured by stacking bricks selected in accordance with the temperature and chemical properties of the molten metal stored in the furnace body 11. Such refractories 17a and 17b are eroded by the molten metal during the operation using the furnace body 11, and particularly the furnace bottom 13
The amount of wear of the refractory 17b increases. Therefore, the furnace body 1
During the operation of the metal smelting furnace using
The hearth replacement device 10 is used to separately prepare the hearth 13 to which the b is attached, and to replace it when the wear of the refractory 17b of the hearth 13 during operation increases.

The hearth exchanging device 10 includes a hearth placing table 18, an air levitation device 19, a support table 20, an elevating device 21, and a traveling vehicle 22. Furnace bottom stand 18
Is an air levitation device 19 provided on the lower surface of a support plate for supporting the furnace bottom 13 placed on the upper surface, and floats on a flat surface of a support table 20 as a support table using an air cushion. be able to. Support table 2
Below 0, a lifting device 21 is provided, which can change the height of the support table 20 from the surface of the traveling vehicle 22. In this embodiment, the furnace bottom support 18 and the air levitation device 1
9 and the height H of the portion of the support table 20 can be reduced compared to the prior art. This makes it easy to secure a necessary lifting stroke.

The traveling vehicle 22 can travel on a track 24 with wheels 23. In the converter for steelmaking, a rail for a steel receiving truck is laid below the furnace body 11, and is used to receive and transport molten steel after the steelmaking process. By using such a rail for a steel receiving truck as the track 24, the traveling truck 22 for the hearth exchanging device 10 can travel by itself or by towing. Ordinary road surface tires or the like may be mounted on the traveling carriage 22 to make the track free.

FIG. 2 shows a simplified configuration of the air levitation device 19 of FIG. The air levitation device 19 includes the rubber bag 2
Approximately 5
Compressed air of about kg / cm ² is supplied through a hose 27, and the furnace bottom table 18 is floated on the surface of the support table 20 with a cushion of compressed air flowing out from the lower opening 28. Since the hearth pedestal 18 floats by air pressure, it can be moved with a light force along the surface of the flat support table 20, and the centering can be easily performed manually.

FIG. 3 shows that the elevating device 21 is raised and the replacement furnace bottom 13 on the furnace bottom placing table 18 is moved to the furnace bottom 1 of the furnace body 11.
2, the inclination is absorbed and the furnace bottom 13 of the furnace bottom 13 is absorbed.
2 shows a state in which close contact with 2 is possible. Since a plurality of rubber bags 25 of the air levitation device 19 are provided at intervals along the lower surface of the hearth base 18, the hearth base 18 is inclined in accordance with the bias of the reaction force received by the hearth 13. Each of the rubber bags 25 can be deformed and adjusted as described above. If the rubber bag 25 is formed using not only the rubber material but also a material having airtightness and elasticity except for the lower opening 28, the same effect can be obtained. Further, an elastic hermetic material such as rubber can be reinforced with a high-strength fiber material or the like.

FIG. 4 shows a more specific configuration of the hearth replacement apparatus 10 of FIG. The support table 20 includes a tilt table 30 and a lift table 31.
A base table 32 is provided on the traveling carriage 22. The base table 32 cannot move in a plane relative to the traveling carriage 22. On the base table 32, a lifting cylinder 33 constituting the lifting device 21 is installed. The elevating cylinder 33 performs the elevating displacement of the lift table 31 on the base table 32. Lift table 3
1 is also provided with a tilt cylinder 34 for tilting the tilt table 30 with respect to the lift table 31. The elevating guide 35 is composed of a plurality of stages of cylinders having different diameters, and is capable of extending and contracting in a telescopic manner (telescopic fitting type) such as a telescope in accordance with the elevating displacement of the lift table 31. The elevating guide 35 is provided to prevent the inclination and the lateral load from being applied to the elevating cylinder 33. A pneumatic unit 36 including a compressor 26 for supplying compressed air to the air levitation device 19 and a hydraulic unit 37 for supplying hydraulic oil for operation to the lifting cylinder 33 and the tilt cylinder 34 are also provided on the traveling carriage 22. Can be The compressed air supplied to the whole factory can be used. In addition, the support table 20 and the furnace bottom
In order to restrict the range in which the hearth table 18 can move relative to the surface of the support table 20, a chain 38 is provided between the To prevent a situation such as dropping.

FIG. 5 shows a state in which the hearth exchanging apparatus 10 of FIG. 4 is viewed in plan. The hearth base 18 and the support table 20 are disk-shaped, and the lifting cylinders 33 are provided at four positions. FIG. 6 shows, from the left side, a state in which the furnace bottom 13 is pushed up by the furnace bottom exchanging device 10 shown in FIG. As aforementioned,
Since the air levitation device 19 including a plurality of rubber bags 25 provided between the furnace bottom table 18 and the support table 20 can easily correct the positional deviation and inclination at the time of centering, the replacement furnace can be used. The bottom 13 is pushed up to the furnace bottom 12 of the furnace body 11 so that the flanges 14 a and 14 b can be brought into close contact with each other so that the bolts 15 can be used for fastening.

The opening diameter of the furnace bottom of the furnace body 11 shown in FIGS. 4 to 6 is about 3 m. The elevating cylinder 33 is capable of realizing a stroke of about 2 to 3 m as a stroke between a raised position of the lift table 31 as shown in FIG. 6 and a lowered position of the lift table 31 as shown in FIG. With such a stroke, the upper part of the refractory 17b of the replacement furnace bottom 13 is formed at the lower position of the lift table 31 as shown in FIG. Lower than the track 24
The traveling carriage 22 can be moved without any obstacle.

In the embodiment described above, the furnace bottom support 18 which is a support plate is connected to the support table 2 which is a surface of the support.
Although an air levitation device 19 is used to levitate above the surface of the zero, not only the cushioning effect of compressed air but also other gas cushions can be utilized as well. Also, not only the gas cushion effect,
It is also possible to levitate using other physical forces, for example, magnetic repulsion. In addition, although the lifting / lowering cylinder 33 is used as the lifting / lowering device 21, the lifting / lowering displacement can be performed by another principle such as a screw or a pantograph mechanism.

[0024]

As described above, according to the present invention, the support plate for supporting the replacement furnace bottom can be floated on the surface of the support base. The displacement in the rotation direction can be easily performed. For centering, it is not necessary to provide a large and complicated mechanism for adjusting the position in the plane direction and the position in the rotation direction while supporting the heavy replacement furnace bottom. The size can be reduced, and the centering operation can be performed quickly. In particular, since the height required from the support plate to the support base can be made smaller than that in the prior art, it is easy to secure a necessary elevating stroke. In addition, since the floating mechanism provided between the support plate and the surface of the support base floats with the compressed gas ejected from the opening at the lower part of the bag formed of the elastic material,
Using the compressed gas cushion, displacement along the surface of the support base can be easily performed, and the deformation of the bag absorbs the biased reaction force when the replacement furnace bottom is inserted into the furnace bottom. In addition, it is not necessary to adjust the tilt direction. Also,
It is also easy to secure the necessary lifting stroke. Further, the support plate is moved up and down by the elevating mechanism provided on the support table, and the support plate is lowered to the lowering position, so that the replacement furnace bottom can be easily carried out from just below the furnace body and can be carried in just below.
When the support base is raised to the raised position, the replacement furnace bottom is inserted into the furnace bottom of the furnace body, and the mounting part formed on the replacement furnace bottom is brought into close contact with the fixed part provided on the furnace body around the furnace bottom. Thus, fastening for fixing the replacement furnace bottom to the furnace body can be easily performed.

According to the present invention, the compressed air is supplied to the rubber bag, and the supporting plate supporting the heavy replacement furnace bottom is floated by the cushion of the compressed air, so that the misalignment or inclination during the centering operation is achieved. Can be easily corrected.

[0026]

[Brief description of the drawings]

FIG. 1 is a simplified front sectional view showing a schematic configuration of a hearth exchanging apparatus 10 according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a part of the air levitation device 19 of FIG.

FIG. 3 shows an air floating device 19 in the hearth replacement device 10 of FIG.
FIG. 4 is a simplified cross-sectional view showing a state in which the furnace bottom 13 is brought into close contact with the furnace body 11 by absorbing the inclination of the furnace.

FIG. 4 is a front sectional view showing a state in which the elevating device 21 is at a lowered position in the hearth exchanging device 10 of FIG.

FIG. 5 is a plan view of the hearth replacement device 10 of FIG.

FIG. 6 is a left side sectional view of the hearth exchanging device 10 of FIG. 4 when the elevating device 21 is at an ascending position.

FIG. 7 is a simplified front sectional view showing a schematic configuration of a conventional hearth exchange apparatus.

[Explanation of symbols]

 10 Furnace Bottom Exchange Device 11 Furnace Body 12 Furnace Bottom 13 Furnace Bottom 14a, 14b Flange 15 Bolt 17a, 17b Refractory 18 Furnace Bottom Stand 19 Air Levitating Device 20 Support Table 21 Lifting Device 22 Traveling Cart 25 Rubber Bag 26 Compressor 27 Hose 28 Opening 30 Tilt table 31 Lift table 32 Base table 33 Lifting cylinder 36 Pneumatic unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-102050 (JP, A) JP-A-8-283821 (JP, A) JP-A-50-158505 (JP, A) 28953 (JP, U) Japanese Utility Model Showa 51-109579 (JP, U) Japanese Utility Model Showa 51-109513 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) C21C 5/48 F27D 1 / 16

Claims (2)

(57) [Claims] 1. A fixing portion for fixing a mounting portion formed on a replacement furnace bottom is formed on a furnace body around the furnace bottom, which can be tilted about a shaft provided above the furnace bottom. ,
A hearth exchanging device for exchanging a furnace bottom with respect to a metal smelting furnace having a replaceable hearth, wherein a support plate for supporting an exchange hearth on an upper surface and a replacement plate for supporting an exchange hearth on an upper surface The lower part of the replacement furnace bottom supported on the upper surface of the support plate, the lower part of the replacement furnace bottom supported below the fixed part of the metal smelting furnace, and the replacement furnace bottom. Into the furnace bottom of the metal smelting furnace, and a supporting table equipped with an elevating mechanism that moves up and down between the elevating position where the mounting part pushes up the supporting plate so that the mounting part is in close contact with the fixed part. A levitation mechanism that levitates the support plate on the support base so that the support plate can be displaced, wherein the levitation mechanism is arranged at intervals along the lower surface of the support plate, and the upper portion is disposed on the lower surface of the support plate. A plurality of bags formed of an elastic material, which are supported and open at a lower portion facing the surface of the support base. , Furnace bottom changer metal refining furnace, which comprises a gas supply device for supplying compressed gas to each bag body. 2. The floating mechanism includes a rubber bag as the bag body, supplies compressed air as the compressed gas from the gas supply device, and corrects misalignment and inclination at the time of centering. The apparatus for exchanging a bottom of a metal smelting furnace according to claim 1, wherein: