The present invention relates, in general, to roofs for ladle furnaces and, more particularly, to a roof for a ladle furnace which can be compatible with a dust collection elbow or a dust collection hood depending on operating conditions.
A steel manufacturing process in which steel is manufactured using iron ore as raw material begins with an ironmaking operation of melting iron on in a shaft furnace. Molten iron which is formed by melting iron on undergoes a primary refining process of successively conducting operations such as dephosphorization, decarburization, deoxidation, etc. and removing impurities from the molten iron, thus forming molten steel.
Molten steel from which impurities have been removed is treated through a secondary refining process, whereby fine component adjustment is realized. Subsequently, the molten steel is transferred to a continuous casting process.
Thereafter, a half-finished product is formed through the continuous casting process. The half-finished product is shaped by a final forming operation such as rolling, thus forming a final product.
An LF (ladle furnace) is a device which is used to finely adjust components of molten steel and desulfurize it after the melting of scrap and the primary refining process are conducted by an electric furnace.
In the ladle furnace, a secondary refining process of adjusting components of molten steel is conducted to make it appropriate for desulfurization and deoxidation in such a way that supplementary material is added to molten steel and then it is treated by Ar bubbling and is arc-heated.
An example of the prior art was proposed in Korean Patent Registration No. 1026515 (Registration date: Mar. 25, 2011, title: Roof device for ladle furnace).
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a roof for a ladle furnace which covers an upper end of the ladle furnace and is able to be compatible with a dust collection elbow or a dust collection hood depending on operating conditions.
The objects of the present invention are not limited to the above object.
In order to accomplish the above object, the present invention provides a roof for a ladle furnace, including: a side part having a vertical cylindrical shape; and a cover part covering an upper end of the side part, with a first seating hole formed in a central portion of the cover part, and a second seating hole formed in the cover part at a position adjacent to the first seating hole, wherein a small ceiling or a dust collection hood is selectively seated into the first seating hole, and a dust collection elbow or a water cooling panel is selectively seated into the second seating hole.
The roof may further include: a plurality of first cotter bodies vertically protruding from the cover part at positions adjacent to the first seating hole so that the small ceiling or the dust collection hood is selectively fastened to the first cotter bodies; and a plurality of second cotter bodies vertically protruding from the cover part at positions adjacent to the second seating hole so that the dust collection elbow or the water cooling panel is selectively fastened to the second cotter bodies.
The dust collection hood may have: a third seating hole formed in an upper portion of the dust collection hood so that the small ceiling is seated into the third seating hole; and a plurality of third cotter bodies to which the small ceiling that is seated into the third seating hole is fastened, wherein the third cotter bodies vertically protrude from the dust collection hood at positions adjacent to the third seating hole.
The cover part may include a carbon supply port provided adjacent to the first seating hole, and the side part may comprise a sampling supply port, wherein each of the carbon supply port and the sampling supply port may include: a portion cover; and a port control unit vertically opening or closing the port cover.
The port control unit may include: an opening control cylinder; a fixed bracket extending from an outer surface of the carbon supply port or the sampling supply port towards the port cover; and a rotating bracket extending from the port cover, the rotating bracket being rotatably coupled to the fixed bracket by a hinge, wherein an extension end of the rotating bracket is connected to an extension end of a cylinder rod of the opening control cylinder.
According to the present invention, a single roof for a ladle furnace can be compatible with a dust collection elbow or a dust collection hood depending on operating conditions. Therefore, the present invention can solve the conventional problem in which the entirety of the roof must be replaced with another when operating conditions are changed. In addition, because it is not required to manufacture different kinds of roofs that correspond to all operating conditions, the production cost related to manufacture of the roof can be reduced.
Furthermore, port covers which are provided on an opening of a carbon support port and an opening of a sampling supply port are configured such that they are respectively rotated by opening control cylinders in the directions facing the openings of the carbon supply port and the sampling supply port. Therefore, even if each port cover is deformed by heat transferred from the ladle furnace, the opening or closing operation can be precisely conducted.
Hereinafter, the present invention will be described with reference to the attached drawings. Reference should now be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components. If detailed descriptions of well-known functions or configurations would unnecessarily obfuscate the gist of the present invention, the detailed descriptions will be omitted.
The ladle furnace roof 100 covers the upper end of he ladle furnace and functions to remove impure elements (sulfur, gas, etc.) generated in the ladle furnace during refining operation and protect the surroundings from melt or slag that spatters during the operation.
A small ceiling into which electrodes are inserted is seated in the ladle furnace roof 100. A carbon supply port, an auxiliary raw material supply hole, a sampling supply port, etc. are installed around the small ceiling. Furthermore, ladle furnace roofs are classified into a roof provided with a dust collection elbow or a roof provided with a dust collection hood for sucking impure elements generated in the ladle furnace and discharging them from the ladle furnace.
The present invention provides a ladle furnace roof which can be compatible with a dust collection elbow or with a dust collection hood depending on operating conditions, in other words, whether to prevent the electrodes installed in the small ceiling from being damaged or worn or to obtain superior dust collection effect.
As shown in
The sampling supply port 116 is provided at a predetermined position in the side part 102. A first seating hole 110, a second seating hole 112, a carbon supply port 114, and an auxiliary raw material supply hole 115 are formed in the cover part 104. The first seating hole 110 is formed in a central portion of the cover part 104. The second seating hole 112, the carbon supply port 114 and the auxiliary raw material supply hole 115 are provided in the cover part 104 at positions adjacent to the first seating hole 110.
As shown in
A third seating hole 176 is formed in an upper portion of the dust collection hood 170 that is fastened to the first cotter bodies 130, and the small ceiling 160 provided with the electrodes E is seated into the third seating hole 176. A plurality of third cotter bodies 150 for fixing the small ceiling 160 to the dust collection hood 170 vertically protrude from the dust collection hood 170 at positions adjacent to the third seating hole 176. In the same manner, the insert holes 164 formed in the small ceiling connection flange are fitted over the respective third cotter bodies 150, and the small ceiling connection flange 162 that is fitted over the third cotter bodies 150 is fastened to the third cotter bodies 150 by cotter pins 154 that are inserted into corresponding cotter holes 152 formed in the respective third cotter body 150.
When the dust collection hood 170 is fixed in the first seating hole 110, at least one support block 179 is provided between the cover part 104 and the exhaust duct 178 that is provided on an outer circumferential surface of the dust collection hood 170 so that the exhaust duct 178 can be supported by the support block 179. Furthermore, when the dust collection hood 170 is fixed in the first seating hole 110, a panel cooling pipe 196 is arranged on the water cooling panel 190, which covers the second seating hole 112, so as to cool heat transferred from the ladle furnace. As can be easily appreciated, a cooling water supply pipe (not shown) and a cooling water discharge pipe (not shown) are connected to the panel cooling pipe 196.
Meanwhile, as shown in
The port covers 118a and 118b respectively open or close an opening of the carbon supply port 114 and an opening of the sampling supply port 116. The port covers 118a and 118b are respectively coupled to the carbon supply port 114 and the sampling supply port 116 so as to be rotatable in directions facing the openings of the carbon supply port 114 and the sampling supply port 116. The port covers 118a and 118b are respectively opened or closed by the port control units 120a and 120b.
The port control units 120a and 120b respectively include opening control cylinders 112a and 122b which are disposed adjacent to the carbon supply port 114 and the sampling support port 116. The port control units 120a and 120b further respectively include fixed brackets 124a and 124b which respectively extend from the outer surfaces of the carbon supply port 114 and the sampling supply port 116 towards the corresponding port covers 118a and 118b, and rotating brackets 126a and 126b which respectively extend from the port covers 118a and 118b and are rotatably coupled to the corresponding fixed brackets 124a and 124b by hinges. Extension ends of the rotating brackets 126a and 126b are respectively connected to cylinder rods 128a and 128b which are extended from or contracted into the opening control cylinders 122a and 122b. That is, when the cylinder rods 128a and 128b which are respectively connected to the rotating brackets 126a and 126b are contracted by the operation of the opening control cylinders 122a and 122b, the port covers 118a and 118b respectively open the carbon supply port 114 and the sampling supply port 116. When the cylinder rods 128a and 128b are extended by the operation of the opening control cylinders 122a and 122b, the port covers 118a and 118b respectively close the carbon supply port 114 and the sampling supply port 116.
Meanwhile, a cooling passage (not shown) is formed in the port cover 118a of the carbon supply port 114 to cool heat transferred from the ladle furnace. The port cover 118b of the sampling supply port 116 which receives heat from the ladle furnace is cooled by an air-cooling method. For this, an air-cooling passage 129a through which air flows and a plurality of air holes 129b connected to the air-cooling passage 129a are formed in the port cover 118b of the sampling supply port 116.
The ladle furnace roof 100 according to the present invention can be compatible with the dust collection elbow 180 or the dust collection hood 170 depending on operating conditions. Therefore, the present invention can solve the conventional problem in which the entirety of the roof 100 must be replaced with when operating conditions are changed. In addition, because it is not required to manufacture different kinds of roofs that correspond to differing operating conditions, the production cost related to manufacture of the roof 100 can be reduced.
Furthermore, in the present invention, the port covers 118a and 118b which are provided on the opening of the carbon support port 114 and the opening of the sampling supply port 116 are configured such that they are respectively rotated by the opening control cylinders 122a and 122b in the directions facing the openings of the carbon supply port 114 and the sampling supply port 116. Therefore, even if the port cover 118a or 118b is deformed by heat transferred from the ladle furnace, the opening or closing operation can be precisely conducted.
Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Number | Date | Country | Kind |
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10-2011-0028502 | Mar 2011 | KR | national |
10-2011-0040072 | Apr 2011 | KR | national |
10-2011-0123651 | Nov 2011 | KR | national |
The present application is a continuation application of International Application No. PCT/KR2011/010140 filed on Dec. 27, 2011, which claims priority to Korean Application Nos. KR 10-2011-0028502 filed on Mar. 30, 2011, KR 10-2011-0040072 filed on Apr. 28, 2011, and KR 10-2011-0123651 filed on Nov. 24, 2011, which applications are incorporated herein by reference.
Number | Date | Country | |
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Parent | PCT/KR2011/010140 | Dec 2011 | US |
Child | 14040410 | US |