KR102263611B1 - Coil support device for annealing furnace - Google Patents

Abstract

Disclosed is a coil support device for an annealing furnace. A coil support device for an annealing furnace according to an embodiment of the present invention includes a base plate installed on the bottom of an annealing furnace, a first stacking plate and a second stacking plate, and a base provided on the base plate to support both lower sides of the coil in a state of being spaced apart from each other. a mounting table provided with a plurality of support frames connecting the plate and the first and second mounting plates, and integrally provided by casting; and a plurality of lower support parts coupled to the lower part of the base plate to support the pedestal and whose lower sides are buried in the floor in the annealing furnace, wherein the first and second stacking plates have an upper surface supporting the coil corresponding to the outer surface of the coil. provided with a curved surface.

Description

Coil support device for annealing furnace {COIL SUPPORT DEVICE FOR ANNEALING FURNACE}

The present invention relates to a coil support device for an annealing furnace capable of stably supporting a coil by dispersing a load and improving durability by preventing thermal deformation.

The annealing process removes the stress inside the steel by heating and maintaining the steel to an appropriate temperature and then cooling it gradually. The furnace used in the annealing process can be classified into a gas annealing furnace, an electric annealing furnace, a batch annealing furnace, a continuous annealing furnace, etc. depending on the type or material handling method.

In a batch-type annealing furnace, coils are heated in a state in which coils on which steel sheets are wound are stacked inside in multiple stages. In the batch type annealing furnace, a plurality of coil support devices are installed on the inner floor to support the coils during the annealing process. The coil support device can prevent the coil from moving or shaking by supporting the lower part of the coil whose outer surface is curved.

However, since this batch annealing furnace repeats heating and cooling of the coil, the coil support device may be deformed or damaged while repeating expansion and contraction by heat. Since a conventional coil support device is manufactured by welding and connecting a plurality of metal plates, when a heavy coil is heated on it, the welded part may be tilted or collapsed as it is thermally deformed.

The conventional coil support device has a defect in that the coil and the support surface are in line contact because the support surface in contact with the outer surface of the coil, which is a curved surface, is in line contact, so that the load of the coil is concentrated on the area in contact with the line and is easily deformed.

An aspect of the present invention is to provide a coil support device for an annealing furnace capable of stably supporting a coil by distributing a load, and improving durability by preventing thermal deformation.

According to an aspect of the present invention, the base plate installed on the floor of the annealing furnace, the first and second stacking plates provided on the base plate to support both lower sides of the coil in a state of being spaced apart from each other, the base plate and the second stacking plate A mounting table provided with a plurality of support frames connecting the first and second mounting plates and integrally provided by casting; and a plurality of lower support parts coupled to the lower part of the base plate to support the pedestal and whose lower sides are buried in the floor in the annealing furnace, wherein the first and second stacking plates have an upper surface supporting the coil and the outer surface of the coil A coil support device for an annealing furnace provided with a curved surface corresponding to may be provided.

The mounting table comprises: a plurality of ventilation holes formed in the base plate positioned below the separation space between the first mounting plate and the second mounting plate; and a plurality of reinforcing jaws formed to be thicker than the thickness of the base plate along the circumference of each of the ventilation holes and protruding in a ring shape from the upper surface of the base plate.

The mounting table may further include a plurality of reinforcing ribs formed to connect the side surfaces of the support frame under the first and second mounting plates, the upper surface of the base plate, and the reinforcing jaws.

The plurality of support frames may be formed to increase in thickness from the first or second stacking plate toward the base plate.

The mounting table may further include a curved rib portion for reinforcing a connection portion between the first and second mounting plates and the plurality of support frames and a connection portion between the plurality of support frames and the base plate.

The loading band is by weight%, C: 0.18 to 0.2%, Si: 0.8 to 1.0%, Mn: 1.0 to 2.0%, P: 0.04% or less, S: 0.03% or less, Ni: 12 to 17%, Cr: 22 to 28%, Mo: contains more than 0 and 0.5% or less, and the balance may be formed of an alloy consisting of Fe and unavoidable impurities.

The base plate may be provided in the form of a rectangular flat plate, and the lower support parts may be respectively installed below the four corners of the base plate.

The lower support part connects the upper plate and the lower plate, and the main post and the auxiliary post are installed in parallel and perpendicular to each other; and a connecting shaft that protrudes upward from the upper plate at the central position of the main post and is inserted into a hole formed in the base plate.

The lower support part may be arranged such that the main post is close to the edge of the base plate and the auxiliary post is close to the center of the base plate.

The lower support portion is radially connected to the outer surface of the main support, the upper and lower ends of the plurality of first reinforcing plates respectively connected to the upper plate and the lower plate; and a plurality of second reinforcing plates radially connected to the outer surface of the auxiliary support so as to face the corners of the upper plate and the lower plate and having upper and lower ends respectively connected to the upper plate and the lower plate.

The base plate may include a plurality of defect grooves recessed upwardly from the lower surface in a shape corresponding to the upper portion of the lower support portion so that the upper portions of the plurality of lower support portions enter and engage, respectively.

The coil support device for an annealing furnace according to an embodiment of the present invention can improve durability by preventing thermal deformation during the annealing process because the mounting table is made of a casting by a heat-resistant material.

The coil support device for an annealing furnace according to an embodiment of the present invention can support the coil stably without shaking because the first and second stacking plates are provided with curved surfaces to support the coil while making surface contact with the outer surface of the coil. There, it is possible to prevent the coil or the mounting table from being deformed by distributing the load of the coil.

In the coil support device for an annealing furnace according to an embodiment of the present invention, since the upper part of the plurality of lower support parts is coupled to the coupling groove formed on the lower surface of the base plate in the state of entry, the mounting table can be easily installed and the mounting table is firmly installed at the installation position. can be fixed.

1 shows an annealing furnace in which a coil support device according to an embodiment of the present invention is installed.
2 is a side view of a coil support device according to an embodiment of the present invention.
3 is an exploded perspective view of a coil support device according to an embodiment of the present invention.
4 is a cross-sectional view taken along line IV-IV' of FIG. 2 .
FIG. 5 is a cross-sectional view taken along line V-V' of FIG. 3 .
6 is a cross-sectional view taken along the line VI-VI' of FIG. 3 .
7 is a cross-sectional view taken along line VII-VII' of FIG. 3 .
8 is a perspective view showing the coupling relationship between the lower support part of the coil support device and the base plate of the mounting table according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains, and are not limited to those presented herein and may be embodied in other forms. In the drawings, in order to clarify the present invention, the illustration of parts not related to the description may be omitted, and the size of the components may be slightly exaggerated to help understanding.

1 shows an annealing furnace in which a coil support device according to an embodiment of the present invention is installed. As shown in Figure 1, the annealing furnace has a body portion 10 having a side wall 12 and a lower wall 13 defining the inner heating space 11, and the body portion 10 covering the upper opening. It may include a cover part (not shown).

Refractory materials 12a and 13a are installed on the inner surface of the side wall 12 and the lower wall 13, and the refractory material 13a of the bottom of the heating space 11 supports the coils C placed in the heating space 11. A plurality of coil support devices 100 are installed to be spaced apart from each other so as to be able to do so.

The coils C in the heating space 11 may be stacked in two or three stages, and the coil support devices 100 installed on the floor of the heating space 11 are stable while bearing the load of the coils (C). It may be connected to each other by the connection part 20 so that it can be supported.

FIG. 2 is a side view of the coil support device 100 , FIG. 3 is an exploded perspective view of the coil support device 100 , and FIG. 4 is a cross-sectional view taken along line IV-IV' of FIG. 2 .

2 to 4, each coil support device 100 is installed on the bottom of the heating space of the annealing furnace and supports the lower portion of the coil (C), the mounting table 110, and the lower portion of the mounting table 110 It supports and includes a plurality of lower support portions 130, the lower side of which is installed in a buried state in the refractory material (13a) of the bottom of the annealing furnace.

The mounting table 110 is installed on the refractory material 13a at the bottom of the annealing furnace, and the base plate 111 is provided in the form of a square flat plate, and the base plate 111 is spaced apart from each other to support both lower sides of the coil C. ) may include a plurality of support frames 114 for connecting the first and second mounting plates 112 and 113, the base plate 111 and the first and second mounting plates 112 and 113 provided on the above. .

The first mounting plate 112 and the second mounting plate 113 are disposed parallel to each other on both sides of the upper portion of the base plate 111 in a state of being spaced apart from each other, and the upper surface supporting the coil C is the outer surface of the coil C. It is provided with a curved surface corresponding to . The curvature of the upper surfaces of the first and second mounting plates 112 and 113 is provided to be the same as the curvature of the outer surface of the coil (C).

Therefore, the first mounting plate 112 and the second mounting plate 113 support the coil (C) in a state where the entire upper surface of the upper surface is in surface contact with the outer surfaces of both lower sides of the coil (C), so that the coil (C) is not shaken. can be supported stably. In addition, since the load of the coil (C) is distributed over the entire upper surface of the first and second mounting plate 112 and 113, the coil C or the mounting table 110 by the load of the coil C in the annealing process. ) can be prevented from being deformed.

A plurality of support frames 114 are, as shown in FIGS. 3 and 4 , the upper surface of the base plate 111 and the lower surface of the first stacking plate 112 or the upper surface of the base plate 111 and the second stacking plate 113 . ) is provided in the form of a panel connecting the lower surface, and is installed vertically to easily withstand the load applied to the first or second mounting plates 112 and 113 .

The plurality of support frames 114 may extend in a horizontal or vertical direction between the first or second mounting plates 112 and 113 and the base plate 111 and may be connected in a mutually intersecting manner. Each support frame 114 may be appropriately spaced in consideration of the load, and a sensor installation hole 114a may be provided in some to allow the temperature sensor 125 to enter the lower portion of the first or second mounting plates 112 and 113 to be installed. can

As shown in FIG. 4 , the plurality of support frames 114 are relatively dense on the four corners so that the support rigidity of the four corners of the base plate 111 coupled to the plurality of lower support portions 130 can be further strengthened. can be very installed.

As shown in FIGS. 2 and 4, the mounting table 110 is a lower position of the separation space 115 between the first mounting plate 112 and the second mounting plate 113, that is, the center of the base plate 111. A plurality of ventilation holes 116 formed in the portion, and a plurality of reinforcing jaws formed to be thicker than the thickness of the base plate 111 along the circumference of each ventilation hole 116 and projecting in a ring shape on the upper surface of the base plate 111 . (117) may be included. The plurality of reinforcing jaws 117 may prevent cracks from occurring around the ventilation hole 116 by strengthening the rigidity of the portion where the ventilation hole 116 is formed. That is, even when the mounting table 110 is heated or cooled in a state where a large load is applied to the mounting table 110 , it is possible to prevent the base plate 111 from being deformed or damaged around the ventilation hole 116 .

The mounting table 110 is the first mounting plate 112 and the second mounting plate 113, the lower side of the support frame 114 (support frame on the side of the separation space), the side of the base plate 111, the upper surface and the reinforcing jaw 117 It may include a plurality of reinforcing ribs 118 formed to be connected. The plurality of reinforcing ribs 118 strengthen the rigidity of the base plate 111 and the support frame 114 around the ventilation hole 116 to prevent the middle portion of the base plate 111 from being bent by heat during the annealing process. can

As shown in FIG. 3 , the mounting table 110 is connected to the first and second mounting plates 112 and 113 and the plurality of support frames 114 connecting portions and the plurality of support frames 114 and the base plate 111 . It may include a curved part 119 for reinforcing the part. The rib portion 119 may be provided integrally with the first and second mounting plates 112 and 113, the support frame 114, and the base plate 111 in the process in which the entire mounting table 110 is integrally formed by casting. have. Since the rib portion 119 reduces the stress concentration of the connection portion while increasing the rigidity of the connection portion, it is possible to significantly increase the rigidity of the mounting table 110 .

As shown in FIG. 7 , the plurality of support frames 114 may have a form in which the thickness gradually increases from the first or second stacking plates 112 and 113 toward the base plate 110 . The lower thickness t2 is thicker than the upper thickness t1 of each support frame 114 . Since these support frames 114 have a form in which the rigidity gradually increases from the top to the bottom, it is possible to prevent buckling due to the load of the coil C, so that the mounting table 110 is exposed to high heat during the annealing process. However, it can be prevented from being deformed.

Since the entire mounting table 110 is integrally formed by casting, it can be easily manufactured despite its complicated shape. In addition, the connection portion of the first or second mounting plates 112 and 113 and the plurality of support frames 114, the connection portion of the plurality of support frames 114 and the base plate 111 are integrally connected by the same material without a welding portion. Therefore, the heat resistance rigidity can be significantly improved. The conventional coil support device could be tilted or collapsed while the welding part was thermally deformed, but since the mounting table 110 of this embodiment does not have such a part, it can maintain high strength even at high heat to prevent deformation.

As shown in FIGS. 2 to 4 , the plurality of lower support portions 130 support the lower portion of the base plate 111 in a state where they are respectively installed below the four corners of the base plate 111 . As in the example of FIGS. 2 and 3 , the rest of the lower support part 130 is installed in a state of being buried in the refractory material 13a of the bottom of the annealing furnace except for a part of the upper side coupled to the base plate 111 , so that the stacking table 110 is horizontal. It can be prevented from being pushed in the direction and deviated from its position. In addition, since most of the load of the coil (C) acting on the mounting table (110) is transmitted to the lower part through the plurality of lower support parts (130), the refractory material (13a) on the floor is caused by the impact generated during the loading process of the coil (C). damage can be minimized.

3, 5, and 6, each lower support unit 130 connects the upper and lower plates 131 and 132, the upper plate 131 and the lower plate 132, which are vertically spaced apart from each other in parallel and perpendicular to each other. The main post 133 and the auxiliary post 134 installed, the connecting shaft 135 protrudes upward from the upper plate 131 at the center position of the main post 133 and is inserted into the hole 111a formed in the base plate 111 . may include.

The main post 133 and the auxiliary post 134 may be provided in a cylindrical shape with high rigidity against vertical load while minimizing the weight. The main post 133 and the auxiliary post 134 are respectively welded to the upper and lower ends of the upper plate 131 and the lower plate 132 .

As shown in FIGS. 3 and 6 , the lower support part 130 is radially connected to the outer surface of the main post 133 , and the upper and lower ends are welded to the upper plate 131 and the lower plate 132 , respectively. A plurality of products connected to the outer surface of the auxiliary post 134 to face the corners of the reinforcing plate 136, the upper plate 131 and the lower plate 132, and having the upper and lower ends welded to the upper plate 131 and the lower plate 132, respectively. Two reinforcing plates 137 may be included. The elements constituting the lower support part 130 may form a solid support structure by being coupled by welding.

When the plurality of lower support portions 130 are coupled to the lower portion of the base plate 111 of the pedestal 110 , as shown in FIGS. 2 and 3 , the main support 133 is close to the edge of the base plate 111 . and the auxiliary support part 134 may be disposed to be close to the center of the base plate 111 .

The lower support 130 has a vertical load transmitted from the mounting table 110 is distributed to the main post 133 and the auxiliary post 134, a plurality of first reinforcing plates 136 and a plurality of second reinforcing plates ( 137), it is possible to stably support the mounting table 110 even in a high-temperature environment.

7 and 8 , the base plate 111 may include a plurality of coupling grooves 120 to which the plurality of lower support parts 130 are coupled. The plurality of coupling grooves 120 are formed to be recessed by a predetermined depth upward from the lower surface of the base plate 111 so that a portion of the upper plate 131 of each lower support part 130 can enter from the lower part and be coupled, and the lower support part It may be provided in a shape corresponding to the shape of the upper plate 131 of the 130 . The plurality of coupling grooves 120 may be formed in the process of forming the mounting table 110 by casting.

When the coil support device 100 is installed, the plurality of lower support parts 130 may be mounted on the plurality of lower support parts 130 in a state in which the plurality of lower support parts 130 are installed on the refractory material 13a of the bottom of the annealing furnace to be coupled. In this way, the plurality of lower support portions 130 are coupled with a part of the upper plate 131 entering the coupling groove 120 on the lower surface of the base plate 111 , and the connecting shaft 135 is connected to the base plate 111 . It enters the hole 111a and is coupled. Therefore, the mounting table 110 can be easily installed on the plurality of lower support parts 130 and can be firmly fixed to the plurality of lower support parts 130 without being pushed or shaken in the lateral direction.

The mounting table 110 is weight %, C: 0.15 to 0.2%, Si: 0.8 to 1.0%, Mn: 1.0 to 2.0%, P: 0.04% or less, S: 0.03% or less, Ni: 12 to 17%, Cr: 22 to 28%, Mo: more than 0 and 0.5% or less, the balance can be formed of a casting made of an alloy consisting of Fe and unavoidable impurities.

Hereinafter, the reason for limiting the alloy composition will be described in detail. All of the following component compositions refer to weight % unless otherwise specified.

The content of C is 0.15 to 0.2%. C is dissolved in the matrix when the casting solidifies, and 0.15% or more is added as an effective element to improve high-temperature strength and creep resistance required as heat-resistant steel. On the other hand, when the C content is excessively high, a large amount of Cr carbide is precipitated, which causes embrittlement problem, so it is preferable to limit it to 0.2% or less. More preferably, it may contain 0.18 to 0.2% of C.

The content of Si is 0.8 to 1.0%. Si acts as a deoxidizer and can improve castability by improving molten metal fluidity. In addition, by forming an oxide film on the surface, high temperature oxidation resistance is improved. For this purpose, the required Si content is 0.8 to 1.0%.

The content of Mn is 1.0 to 2.0%. Mn combines with S to form MnS. It is added at 1.0% or more to prevent high-temperature cracking and improve toughness. Conversely, the upper limit is limited to 2.0% because it can lead to an increase in MnS when added excessively, thereby reducing toughness and red hot brittleness.

The content of P is 0.04% or less, and the content of S is 0.03% or less. P and S are elements treated as impurities by lowering corrosion resistance, and are managed at 0.04% or less and 0.03% or less, respectively.

The content of Ni is 12 to 17%. Ni is an austenite phase stabilizing element, and is a very effective element for corrosion resistance and heat resistance. By improving heat resistance and oxidation resistance, the effect of preventing high temperature deterioration can be expected. For this purpose, 12% or more is added, but since Ni is an expensive element, it causes an increase in raw material cost when added in a large amount. Therefore, the upper limit is set to 17%.

The content of Cr is 22 to 28%. Cr is added by 22% or more to ensure oxidation resistance and high-temperature strength. However, when a large amount is added, the amount of dispersed Cr carbide increases, which may adversely affect ductility. Therefore, the upper limit is limited to 28%.

The content of Mo is more than 0 and 0.5% or less. Mo is also added as an essential element because it improves creep resistance by bonding with C to form carbide, and improves internal hardenability and high-temperature breaking strength. However, when a large amount is added, the ductility deteriorates, so it is limited to 0.5% or less. More preferably, it may contain 0.18 to 0.4% of Mo.

By manufacturing the mounting table 110 with the alloy made of such a composition, the wear resistance and heat resistance of the mounting table 110 can be improved, and the high-temperature deterioration corrosion suppression function can be improved.

100: coil support device, 110: mounting table,
111: base plate, 112: first stacking plate,
113: second stacking plate, 114: support frame,
116: ventilation hole, 117: reinforcing jaw,
118: reinforcing rib, 119: rib portion,
120: coupling groove, 130: lower support part,
131: upper plate, 132: lower plate,
133: main holding, 134: auxiliary holding,
135: connecting shaft, 136: first reinforcing plate,
137: second reinforcing plate.

Claims (11)

The base plate installed on the bottom of the annealing furnace, the first and second mounting plates provided on the base plate to support both lower sides of the coil in a state of being spaced apart from each other, and the base plate and the first and second mounting plates are connected a pedestal provided with a plurality of support frames and integrally formed by casting; and
A plurality of lower support parts coupled to the lower part of the base plate to support the pedestal and whose lower sides are buried in the floor in the annealing furnace; includes,
The first and second mounting plates are provided with a curved surface corresponding to the outer surface of the upper surface supporting the coil,
The holding stand,
a plurality of ventilation holes formed in the base plate positioned below the space between the first and second placing plates; and
A coil support device for an annealing furnace further comprising a; a plurality of reinforcing jaws formed to be thicker than the thickness of the base plate along the circumference of each of the ventilation holes and projecting in a ring shape on the upper surface of the base plate. delete According to claim 1,
The mounting table further comprises a plurality of reinforcing ribs formed to connect the side surfaces of the support frame under the first and second mounting plates, the upper surface of the base plate, and the reinforcing jaws. According to claim 1,
The plurality of support frames are formed to increase in thickness from the first or second stacking plate toward the base plate. According to claim 1,
The mounting table is an annealing furnace coil support device further comprising a connecting portion of the first and second mounting plates and the plurality of support frames, and a curved rib portion for reinforcing a connection portion between the plurality of support frames and the base plate. According to claim 1,
The loading band is by weight%, C: 0.18 to 0.2%, Si: 0.8 to 1.0%, Mn: 1.0 to 2.0%, P: 0.04% or less, S: 0.03% or less, Ni: 12 to 17%, Cr: 22 to 28%, Mo: contains more than 0 and 0.5% or less, and the balance is a coil support device for an annealing furnace formed of an alloy consisting of Fe and unavoidable impurities. According to claim 1,
The base plate is provided in the form of a rectangular flat plate,
The lower support portion is a coil support device for an annealing furnace, respectively installed on the lower side of the four corners of the base plate. 8. The method of claim 7,
The lower support part,
Main and auxiliary posts connecting the upper and lower plates and installed in parallel and perpendicular to each other; and
A coil support device for an annealing furnace including a connecting shaft that protrudes upward from the upper plate at the central position of the main post and is inserted into a hole formed in the base plate. 9. The method of claim 8,
The lower support portion is a coil support device for an annealing furnace disposed so that the main post is close to the edge of the base plate and the auxiliary post is close to the center of the base plate. 9. The method of claim 8,
The lower support part,
a plurality of first reinforcing plates radially connected to the outer surface of the main post and having upper and lower ends respectively connected to the upper and lower plates; and
The coil support device for an annealing furnace further comprising a plurality of second reinforcing plates radially connected to the outer surface of the auxiliary support so as to face the corners of the upper plate and the lower plate, and the upper and lower ends are respectively connected to the upper plate and the lower plate. 8. The method of claim 7,
The base plate is a coil support device for an annealing furnace including a plurality of coupling grooves recessed upward from the lower surface in a shape corresponding to the upper portion of the lower support portion so that the upper portion of the plurality of lower support portion enters and engages, respectively.

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