WO2018119548A1

WO2018119548A1 - Sealing method, sealing device, and continuous casting apparatus provided with the sealing device

Info

Publication number: WO2018119548A1
Application number: PCT/CN2016/112004
Authority: WO
Inventors: 北本博子; 冈安晋平; 富野贵义; 堀井健治; 张健; 王成全; 方园
Original assignee: 普锐特冶金技术日本有限公司; 宝山钢铁股份有限公司
Priority date: 2016-12-26
Filing date: 2016-12-26
Publication date: 2018-07-05
Also published as: CN110087798B; CN110087798A

Abstract

A sealing device (50) for sealing a gap (81) between a pair of casting rollers (11a, 11b) and a casting chamber (20, 20B). The casting chamber (20, 20B) is provided below the pair of casting rollers (11a, 11b) and is provided with an upper opening (21a) allowing passage of a sheet (2) emerging from the pair of casting rollers (11a, 11b). The sealing device (50) is provided with an inert gas nozzle (54a, 54b) for spraying an inert gas at respective perimeter surfaces (11aa, 11ba) of the pair of casting rollers (11a, 11b). The sealing device (50) achieves a simpler and more efficient seal of the gap (81) between the pair of casting rollers (11a, 11b) and the casting chamber (20, 20B) below the rollers.

Description

Sealing method, sealing device and continuous casting device having the same

Technical field

The present invention relates to a sealing method, a sealing device, and a continuous casting device having the sealing device.

Background technique

In the continuous casting apparatus, the inside of the casing provided in the lower portion of the pair of casting rolls (cooling rolls) is set as an atmosphere control space (a low-oxygen environment space realized by supply of an inert gas), and is made from a pair of castings. A high temperature strip drawn between the rolls passes through the housing to prevent oxidation of the strip. However, when the temperature of the atmosphere of the space rises, thermal distortion occurs on the casing or at the joint portion of the casing and the apparatus, etc., so that a void is generated at the joint portion or the like. In addition, since the high-temperature gas is lower in density than the outside air, buoyancy is generated. Thereby, since the internal gas flows out to the outside through the gap, and the outside air flows into the inside of the casing, it is necessary to supply the inert gas to the inside of the casing in accordance with the outflow amount to the outside. Therefore, various methods for suppressing the outflow of the inert gas inside the casing to the outside have been examined.

For example, Patent Document 1 listed below discloses a twin roll casting machine having an elastic sealing member interposed between a flange constituting a sealed chamber of a casting assembly and an upper flange on a pipe side, and a pipe interposed therebetween An elastic sealing member between the lower lower flange and a peripheral portion surrounding the upper opening portion of the casing, and biasing the upper portion of the pipe by the hydraulic cylinder, thereby maintaining the joint portion of the casting assembly and the pipe in a hermetic seal, And the connecting portion of the pipe and the surrounding casing is kept hermetically sealed.

Further, Patent Document 2 listed below discloses a twin-roll type casting machine including an envelope case that surrounds a thin strip from a cooling roll to a pinch roll, and is disposed at a distal end portion that surrounds the inside of the case. a pair of oscillating walls approaching or leaving the surface of the strip, a sealing roller pivotally supported at the top end of the oscillating wall, a sealing member interposed between the peripheral portion of the oscillating wall and the inner side surface surrounding the housing, and feeding the inside of the surrounding housing a gas pipe in which the flow of the inert gas from the lower side of the swing wall to the upper side of the swing wall is suppressed by rotating the respective swing walls such that the seal rolls are located in close proximity of the strips .

Prior technical literature

Patent literature

Patent Document 1: Japanese Patent No. 4165147

Patent Document 2: Japanese Laid-Open Patent Publication No. 2004-130385

Summary of the invention

Problem to be solved by the invention

However, in the twin-roll type casting machine described in Patent Document 1, a sealing member or the like is disposed at a connection portion between the cooling roller and the sealed chamber, but since the sealing member abuts on the outer peripheral surface of the cooling roller, There is a possibility of hindering the rotation to the cooling roller. In addition, it is necessary to provide a flange, an elastic sealing member, and a pressure cylinder, so that the structure of the device becomes correspondingly complicated.

In the twin-roll type casting machine described in Patent Document 2, a gap is formed in a connection portion between the surrounding case and the cooling roll forming the atmosphere control space so as not to hinder the rotation of the cooling roll. As a result, since there is an opening in the upper portion of the structure, the inert gas supplied to the inside of the casing flows out from the opening of the upper portion, and the outside air flows into the inside of the casing, so that it is impossible to obtain a sufficient prevention of the ribbon. The possibility of an oxidizing effect. Further, in the twin-roll casting machine described in Patent Document 2, it is necessary to provide a swing wall, a seal roller, and a sealing member, and the structure thereof becomes correspondingly complicated.

As described above, the present invention has been made to solve the problems described above, and an object of the invention is to provide a space portion between a pair of rollers and a casing below it with relatively high efficiency. A sealing method for sealing, a sealing device, and a continuous casting device including the sealing device.

Method for solving the problem

A sealing device according to the present invention for solving the above problems is directed to a pair of rollers and a case disposed below the pair of rollers and having an upper opening portion through which a thin strip that can be drawn between the pair of rollers passes The gap between the bodies is sealed, and the sealing device is characterized in that it has an inert gas nozzle that injects an inert gas toward the respective circumferential surfaces of the pair of rolls. .

A continuous casting apparatus according to the present invention for solving the above problems is characterized by comprising: a pair of rollers; and a casing having a thin strip capable of ejecting between the pair of rollers under the pair of rollers a passing upper opening; a sealing device that seals a gap between the pair of rollers and the casing.

A sealing method according to the present invention for solving the above-described problems is to form a pair of rollers and an upper opening portion disposed below the pair of rollers and having a thin strip that can be taken out between the pair of rollers a sealing method for sealing a gap between the casings, wherein the sealing method is characterized in that an inert gas is sprayed toward the respective circumferential surfaces of the pair of rollers by an inert gas nozzle, and the inert gas is caused along The circumferential surfaces of the pair of rollers circulate in the direction of the thin strip.

Effect of the invention

According to the present invention, it is possible to relatively easily seal the gap between the pair of rollers and the casing below it with higher efficiency.

DRAWINGS

FIG. 1 is a schematic view of a continuous casting apparatus including a sealing device according to a first embodiment of the present invention.

Fig. 2 is an enlarged view of the encircling line II in Fig. 1.

Fig. 3 is an explanatory view showing an example of an inert gas nozzle provided in the sealing device.

Fig. 4 is an explanatory view showing another example of the sealing device.

Fig. 5 is an explanatory view showing another example of the inert gas nozzle provided in the sealing device.

Fig. 6 is an explanatory diagram of still another example of the inert gas nozzle.

FIG. 7 is an explanatory view of a continuous casting apparatus including a sealing device according to a second embodiment of the present invention.

FIG. 8 is an explanatory view of a continuous casting apparatus including a sealing device according to a third embodiment of the present invention.

detailed description

Hereinafter, each embodiment of the sealing method, the sealing device, and the continuous casting device including the sealing device according to the present invention will be described with reference to the drawings.

First embodiment

A sealing method, a sealing device, and a continuous casting device including the sealing device according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6 .

As shown in FIG. 1 and FIG. 2, the continuous casting apparatus 100 according to the present embodiment includes a pair.

Casting rolls

11a, 11b, casting chamber (housing) 20, sealing device 50, and control device 90.

Preferably, the pair of

casting rolls

11a and 11b are disposed at the same height, and their respective central axes C1 and C2 are horizontally and in parallel. Preferably, the pair of

casting rolls

11a and 11b are disposed so as to be adjustable in the size of the gap therebetween.

Side panels

13a, 13b are provided at both axial ends of the pair of

casting rolls

11a, 11b. In the internal space (melt portion) 15 of the moving mold composed of the pair of

casting rolls

11a and 11b and the

side shingles

13a and 13b, the molten metal 1 is supplied through a nozzle (not shown).

The inside of the pair of

casting rolls

11a and 11b is configured to allow the coolant to flow. Thus, the pair of

casting rolls

11a and 11b are rotated in the directions A1 and A2 so that the mutually opposing sides are downward, whereby the molten metal 1 in the molten pool portion 15 is cooled. The circumferential surfaces 11aa and 11ba of the

casting rolls

11a and 11b are solidified, and the thin strip (thin sheet) 2 is drawn downward from between the pair of

casting rolls

11a and 11b.

The casting chamber 20 is disposed below the pair of

casting rolls

11a, 11b. The casting chamber 20 has a top plate 21, a bottom plate 22,

side plates

25 and 26, a driving side and a side plate (not shown) on the operation side, and a door 27 disposed below the side plate 25. A door opening and closing device 40 that opens and closes the door 27 is provided in the casting chamber 20. The door opening and closing device 40 has a hinge 41 and a hook link 43 that is connected to the door 27 at the distal end side and is fixed to the side plate 25 via the bracket 42 at the proximal end side. The hinge 41 is provided on the door 27 and the side plate 25 so that the lower end side can be rotated by using the upper end side of the door 27 as a fulcrum. Thus, by extending the hook link 43, the door 27 is closed by the door 27, and as will be described later, the inside of the casting chamber 20 becomes an atmosphere control space. On the other hand, by shrinking the hook link 43 to open the lower side of the side plate 25, the waste shovel 31 disposed inside can be conveyed to the outside.

A guide table (not shown) and a guide roller group 35 are disposed in the casting chamber 20. The guide roller group 35 has four guide roller 35s to 35d arranged side by side in the tape feeding direction of the ribbon 2. Thereby, the thin strip 2 which is drawn downward from between the

casting rolls

11a and 11b is supported by the guide stage roll group 35, and is carried out in the lateral direction.

A pair of upper and lower pinch rollers (tension applying devices) 37a and 37b are disposed in the casting chamber 20 so as to be adjacent to the fourth leading roller 35d. Thereby, tension is applied to the thin strip 2 which is passed through the guide table roll group 35 in the lateral direction. In addition, the thin strip 2 to which the tension is applied by the pair of upper and

lower pinch rollers

37a and 37b is further passed to a rolling mill disposed on the downstream side in the tape insertion direction (not shown), and is carried by the rolling mill. Rolling. In addition, the first to fourth guide roller 35a to 35d, The

pinch rollers

37a and 37b and the rolling mill are disposed such that the strap 2 can be worn in a substantially horizontal direction.

The top plate 21 of the casting chamber 20 is provided with an upper opening 21a through which the thin strip 2 drawn from between the pair of casting rolls 11a and 11b passes. The side plate 26 is provided with a side opening portion 26a through which the thin strip 2 to which tension is applied by the pair of upper and

lower pinch rollers

37a and 37b is passed. The side opening portion 26a is sealed by a side opening sealing device (not shown) so that outside air does not enter. Inert

gas blowing inlets

21b and 25a are provided in the top plate 21 and the side plate 25, respectively. Inert

gas feed pipes

71, 72 for supplying inert gases G2, G1 into the casting chamber 20 are connected to the inert

gas blowing inlets

21b, 25a, respectively. The inert gases G2 and G1 are supplied into the casting chamber 20 via the inert

gas feed pipes

71 and 72, so that the inside of the casting chamber 20 becomes an atmosphere control space (low oxygen atmosphere space).

The sealing device 50 has an inert gas supply source 51, an inert gas supply pipe 52, an inert gas supply pump 53, and a pair of

inert gas nozzles

54a and 54b. As the inert gas supply source 51, for example, a can or the like that accommodates an inert gas can be used.

The inert gas supply source 51 is connected to the proximal end sides of the pair of

inert gas nozzles

54a and 54b via the inert gas supply pipe 52. The

inert gas nozzles

54a and 54b are disposed on the periphery of the upper opening 21a of the top plate 21 below the casting rolls 11a and 11b. The

inert gas nozzles

54a and 54b are for the purpose of improving the effect of preventing oxidation of the thin strip 2 directly under the casting rolls 11a and 11b, and are opposed to the perpendicular lines L1 and L2 passing through the central axes C1 and C2 of the casting rolls 11a and 11b. It is disposed on the side of the upper opening portion 21a. The distal end portion of the inert gas nozzle 54a is disposed toward the circumferential surface 11aa of the casting roller 11a disposed above the inert gas nozzle 54a. The distal end portion 54ba of the inert gas nozzle 54b is disposed toward the circumferential surface 11ba of the casting roller 11b disposed above the inert gas nozzle 54b. Further, it is preferable that the heat insulating material 59 is disposed on the upper opening portion 21a side with respect to the

inert gas nozzles

54a and 54b. This is because it is possible to prevent thermal deformation or breakage of the

inert gas nozzles

54a and 54b due to heating from the thin strip 2, and it is possible to maintain the sealing performance.

The inert gas supply pump 53 is provided on the inert gas supply pipe 52. The inert gas supply pump 53 is connected to the output side of the control device 90 that controls the various devices described above, and supplies the inert gas G10 supplied from the inert gas supply pump 53 to the inert gas nozzle 54a based on the signal from the control device 90. The supply amount supplied by 54b is adjusted.

That is, the above-described control device 90 controls the inert gas supply pump 53 so that the inert gas ejected from the

inert gas nozzles

54a, 54b is along the circumferential faces 11aa, 11ba of the casting rolls 11a, 11b. It flows in the direction of reaching the ribbon 2. Thereby, the flow direction of the inert gas G11 injected from the one inert gas nozzle 54a is opposite to the rotation direction of the one casting roll 11a, and the direction is opposite to the direction of rotation A1 of the one casting roll 11a. The circumferential surface 11aa of the casting roll 11a flows and reaches the one surface (back surface) side of the thin strip 2 which is taken out between the one casting roll 11a and the other casting roll 11b. Further, the flow direction of the inert gas G12 ejected from the other inert gas nozzle 54b is opposite to the rotation direction of the other casting roll 11b, and is along the direction opposite to the rotation direction A2 of the other casting roll 11b. The other circumferential surface 11ba of the casting roll 11b flows and reaches the other surface (surface) side of the thin strip 2 which is taken out between the other casting roll 11b and one casting roll 11a.

Then, the inert gas that has reached the one surface side and the other surface side of the thin strip 2 respectively flows downward together with the thin strip 2 directly under the pair of casting rolls 11a and 11b in the direction in which the strip 2 passes.

Thus, by controlling the inert gas supply pump 53 to control the injection amount of the inert gas injected from the

inert gas nozzles

54a, 54b, the inert gas ejected from the pair of

inert gas nozzles

54a, 54b is brought from the pair. The respective circumferential surfaces 11aa and 11ba of the casting rolls 11a and 11b flow toward the one surface side and the other surface side of the thin strip 2, and further flow downward along the thin strip 2, so that the flow of the inert gas is caused. The gap portion 81 between the pair of casting rolls 11a and 11b and the casting chamber 20 is sealed with respect to the outside air. That is, the thin strip 2 circulates in the internal space formed by the casting rolls 11a and 11b, the inert gas, and the casting chamber 20.

As a result, even if the gas in the casting chamber 20 is heated by the thin strip 2 and the upward flow is generated due to the temperature difference between the inside and the outside of the casting chamber 20, the gas is to be circulated from the upper opening 21a to the outside, and the gas is also raised. The descending gas flow of the inert gas opposed to the gas flow prevents the outflow of the internal gas to the outside of the casting chamber 20. In addition, the inflow of outside air into the casting chamber 20 is also prevented. Thereby, the inside of the casting chamber 20 is maintained at a predetermined oxygen concentration (for example, 5% or less), thereby maintaining the oxidation preventing effect of the thin strip 2.

Further, since the inert gases G11 and G12 supplied from the

inert gas nozzles

54a and 54b flow along one surface and the other surface of the ribbon 2, the side of the ribbon 2 and the vicinity of the other surface can be maintained at a low oxygen concentration. Thereby, the oxidation of the ribbon 2 can be prevented with higher efficiency.

Further, in the above description, the inert gas supply pump 53, the control device 90, and the like constitute an inert gas injection amount adjustment unit.

Therefore, according to the present embodiment, by injecting the inert gas G11, G12 toward the pair of casting

rolls

11a, 11b by the

inert gas nozzles

54a, 54b, the inert gases G11, G12 are cast along a pair The

rollers

11a and 11b flow into the thin strip 2, and flow together with the thin strip 2 from the upper opening 21a into the casting chamber 20. Thereby, the gap portion 81 between the pair of casting rolls 11a and 11b and the casting chamber 20 is sealed by the inert gases G11 and G12.

Further, by using the inert gas supply pump 53 and the control device 90 to adjust the injection amounts of the inert gases G11 and G12, an inert gas G11 is generated in the gap portions 81 of the pair of casting rolls 11a and 11b and the casting chamber 20. , G12's downdraft. By this downward flow, the upward flow is suppressed, and the inert gas in the casting chamber 20 is prevented from flowing out to the outside, and the outside air is prevented from flowing into the casting chamber 20 due to the outflow of the inert gas to the outside.

Further, in the vicinity of the gap portion 81, since the inert gases G11 and G12 flow along one surface and the other surface of the ribbon 2, oxidation of the ribbon 2 can be prevented with high efficiency.

The inert gas nozzle provided in the above-described sealing device can also be disposed outside the region surrounded by a perpendicular line passing through the central axis of the pair of casting rolls.

It is preferable that the

inert gas nozzles

54a and 54b provided in the above-described sealing device are disposed such that their respective distal end portions are inclined toward the upper opening portion 21a (thin strip 2) side.

Regarding the injection direction of such an inert gas, a case where the inert gas nozzle for being disposed under the other casting roller is used will be described with reference to FIG. Fig. 3 is a cross-sectional view orthogonal to the rotation axis of the casting roll 11b. Similarly to the above-described sealing device 50, the sealing device 50A includes an inert gas supply source, an inert gas supply pipe, an inert gas supply pump, an inert gas nozzle provided on one side of the casting roll that is paired with the other casting roll, and An inert gas nozzle 54Ab provided on the other casting roll 11b side as shown in Fig. 3 is provided. Preferably, the inert gas nozzle 54Ab is disposed on the top plate 21 of the casting chamber 20 in such a manner as to be in the ejection direction of the inert gas injected from the tip end portion 54Aba when viewed from the direction of the rotation axis of the casting roller 11b. The angle θ formed on the side of the thin strip 2 by the line L3, the tangent L4 at the intersection with the line L3 of the ejection direction of the inert gas and the circumferential surface 11ba of the casting roll 11b is larger than 0 degree and smaller than 90 degrees. Further, the inert gas may be diffused in a radial manner, and L3 is set as a center line starting from the injection port of the inert gas nozzle 54Ab.

Most rotational direction Q ₁ toward the casting rolls 11b will thus, the inert gas is ejected from the nozzle 54Ab Q the total amount of inert gas in A2 direction opposite to the flow, the residual portion Q ₂ (<Q ₁₎ will be facing It flows in the same direction as the rotation direction A2 of the casting roll 11b. Thereby, it is possible to suppress the flow of the inert gas to the outside, and to supply the inert gas into the casting chamber 20 with high efficiency.

The above sealing device preferably has an air nozzle which is formed with an inert gas nozzle That is, and is disposed outside the pair of inert injection nozzles with respect to the thin strip 2 . Regarding such a sealing device, a case where an inert gas nozzle for being disposed under the other casting roller is used will be described with reference to FIG. 4 is a cross-sectional view orthogonal to the rotation axis of the casting roll 11b. Similarly to the above-described sealing device 50, the sealing device 50B includes an inert gas supply source, an inert gas supply pipe, an inert gas supply pump, and an inert gas nozzle provided on one side of the casting roll that is paired with the other casting roll, such as As shown in Fig. 4, an inert gas nozzle 54b provided on the other casting roll 11b side and an air nozzle 58b disposed adjacent to the inert gas nozzle 54b are provided. The base end of the air nozzle 58b is connected to the air supply source 55 via the air supply pipe 56. An air supply pump 57 is provided on the air supply pipe 56. The air supply pump 57 can be controlled by the control device 90 provided in the sealing device 50 described above. It is preferable that the air nozzle 58b is disposed such that the tip end portion 58ba thereof has an angle toward the side opposite to the strip side 2 (the upper opening portion 21a side). Thereby, most of the air G13 ejected from the air nozzle 58b flows in the same direction as the rotation direction A2 of the casting roll 11b. The remaining portion G13a of the air ejected from the air nozzle 58b flows in a direction opposite to the rotation direction A2 of the casting roller 11b. That is, when air is ejected from the air nozzle 58b toward the circumferential surface 11ba of the casting roll 11b, the main air flow is generated in the same direction as the rotational direction A2 of the casting roll 11b, and on the other hand, in the rotational direction with the casting roll 11b. A2 in the opposite direction produces a secondary flow with less gas flow than the primary flow. Since the secondary gas passing through the air pushes the inert gas back, the inert gas is prevented from flowing out to the outside without allowing excess air to flow into the casting chamber 20. As a result, the inert gas injected from the inert gas nozzle 54b can be efficiently supplied into the casting chamber 20 by using the air nozzle 58b. Further, the inert gas nozzle 54b can be freely moved in the vertical direction Z1 or can be freely adjusted in the rotational direction R1. The air nozzle 58b can be freely moved in the vertical direction Z2 or can be freely adjusted in the rotational direction R2.

The inert gas nozzle described above ejects an inert gas toward the respective circumferential surfaces 11aa and 11ba of the pair of casting rolls 11a and 11b, and causes the inert gas to reach along the circumferential surfaces 11aa and 11ba of the pair of casting rolls 11a and 11b. In the inert gas nozzle that flows in the direction of the thin strip 2, as shown in FIG. 5, it is also possible to arrange a plurality of adjacently in the extending direction of the central axis C2 of the casting roll 11b (10 in FIG. 5). The double nozzle 54Cb is configured by a nozzle 54Cba. Further, as shown in FIGS. 6(a) and 6(b), the inert gas nozzle described above may be plural in the extending direction of the central axis C2 of the casting roll 11b (in FIG. 6(b) Six) slit nozzles 54Db of the adjacent slits 54Dbb. By using

such sealing devices

50C and 50D having the nozzles 54Cb and 54Db, it is possible to substantially extend the entire circumferential direction of the center axis C2 with respect to the circumferential surface 11ba of the casting roll 11b. The inert gas is uniformly injected, and the inert gas can be circulated substantially uniformly across the width direction as a whole along the one surface (back surface) and the other surface (surface) of the thin strip 2 . The multiple nozzles are disposed in parallel with the central axis of the casting rolls, and are opposed to the casting rolls. Further, a plurality of nozzles are disposed at least from one end of the casting roll to the other end. The slit nozzle is provided with a plurality of slits so as to be parallel to the central axis of the casting roll, and is opposed to the casting rolls. Further, a plurality of nozzles are disposed at least from one end of the casting roll to the other end. The size of the opening as a nozzle of a plurality of nozzles or a plurality of slits is easily produced with high precision. The slit nozzle is not limited to being constituted by a plurality of slits, and may be a slit in which the slit of the slit opens at least from one end of the casting roller to at least the entire extending direction of the central axis. Formed at one end. Here, it is not necessary to be parallel in a strict sense to be parallel to the central axis of the casting roll.

Second embodiment

A sealing method, a sealing device, and a continuous casting device including the sealing device according to a second embodiment of the present invention will be described with reference to Fig. 7 . Moreover, the continuous casting apparatus according to the present embodiment has a configuration in which a cooling device is added to the first embodiment described above. In the present embodiment, the same components as those of the continuous casting apparatus according to the first embodiment described above are denoted by the same reference numerals.

As shown in FIG. 7 , the continuous casting apparatus 100A according to the present embodiment includes a pair of casting rolls 11 a and 11 b , a casting chamber (housing) 20 , a sealing device 50 , and a cooling device, similarly to the above-described continuous casting apparatus 100 . 60 (cooling unit) and control device 90A.

An example of the structure of a cooling device in the case where water is used as the refrigerant is shown. The cooling device 60 has a water supply source 61, a water supply pipe 62, a water supply pump 63, a water-cooling jacket 64, and a drain pipe 67. As the water supply source 61, for example, a tank that can store water (refrigerant) or the like can be used. The water supply source 61 is connected to the lower side of the water-cooling jacket 64 via the water supply pipe 62. The water supply pump 63 is disposed on the water supply pipe 62. The water jacketed jacket 64 is disposed on the top plate 21, the

side plates

25, 26 of the casting chamber 20, the operating side, and the side plates (not shown) on the driving side. The proximal end side of the drain pipe 67 is connected to the upper side of the water-cooling jacket 64. Thereby, the water in the water supply source 61 is supplied into the water-cooling jacket 64 through the water supply pipe 62 through the water supply pump 63. The water in the water-cooling jacket 64 cools the

side plates

25, 26 and the top plate 21 of the casting chamber 20, and the water after the cooling is used is discharged to the outside via the drain pipe 67. In addition, the water-cooling jacket 64 can also be disposed on the bottom plate 22 and the door 27 of the casting chamber 20. It is also possible to connect the distal end side of the drain pipe 67 to the water supply source 61. In this case, in order to maintain the temperature of the water, it is preferable to provide a heat exchanger in the flow path of the water.

Therefore, according to the present embodiment, it is possible to prevent the temperature rise of the casting chamber 20 caused by the thin strip 2, and accordingly, the generation of the ascending air current accompanying the temperature rise of the internal gas can be suppressed. Therefore, the gap portion 81 between the pair of casting rolls 11a and 11b and the casting chamber 20 below it can be sealed relatively easily and more efficiently.

Third embodiment

A sealing method, a sealing device, and a continuous casting device including the sealing device according to a third embodiment of the present invention will be described with reference to Fig. 8 . Further, the continuous casting apparatus according to the present embodiment has a structure in which the inert gas feed pipe is removed from the above-described first embodiment. In the present embodiment, the same components as those of the continuous casting apparatus according to the first embodiment described above are denoted by the same reference numerals.

As shown in FIG. 8, the continuous casting apparatus 100B according to the present embodiment includes a pair of casting rolls 11a and 11b and a sealing device 50, and includes a casting chamber (housing) 20B and a control device, similarly to the above-described continuous casting device 100. 90B.

The casting chamber 20B is different from the casting chamber 20 provided with the inert

gas feeding pipes

71, 72 of the continuous casting apparatus 100 according to the first embodiment described above, and the casting chamber 20B is a structure in which an inert gas feeding pipe is not connected. .

Therefore, in the present embodiment, only the inert gases G11 and G12 injected from the

inert gas nozzles

54a and 54b of the sealing device 50 are supplied into the casting chamber 20B. The control device 90B and the inert gas supply pump 53 adjust the injection amount of the inert gas so that the inside of the casting chamber 20B becomes a predetermined oxygen concentration (for example, 5%) or less. Thereby, the inside of the casting chamber 20B becomes an atmosphere control space (low oxygen atmosphere space).

Here, regarding the above-described continuous casting device (in the case where the inert gas is supplied to the casting chamber only by the sealing device) and the conventional continuous casting device (in the case where the inert gas is fed into the casting chamber only by the inert gas feeding pipe), The simulation was carried out with the oxygen concentration near the ribbon. In this simulation, the conditions such as the supply amount of the inert gas are set to be the same.

In a conventional continuous casting apparatus that feeds an inert gas into a casting chamber only by an inert gas feed pipe, the oxygen concentration is about 10% on one side (back surface) side and the other surface (surface) side of the ribbon. On the other hand, in the continuous casting apparatus of the present embodiment which supplies the inert gas to the casting chamber only by the sealing device, the oxygen concentration is 2% on one side (back surface) side and the other surface (surface) side of the ribbon. the following. From the results of the simulation, it can be inferred that the inert gas can be supplied to the casting chamber by only using the sealing device, and can be in the vicinity of one side and the other side of the ribbon. Effectively reduce the oxygen concentration.

Therefore, according to the present embodiment, by supplying the inert gas into the casting chamber 20B by only the sealing device 50, the space in the casting chamber 20B can be filled with the inert gas. Thereby, it is not necessary to connect an inert gas feed pipe or the like for feeding an inert gas into the casting chamber, so that the connection portion connected to the casting chamber can be eliminated. Therefore, the gap portion 81 between the pair of casting rolls 11a and 11b and the casting chamber 20B below it can be sealed relatively easily with higher efficiency.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications and combinations can be made without departing from the scope of the invention.

Symbol Description

1: molten metal; 2: thin strip (thin plate); 11a, 11b: casting roll; 11aa, 11ba: circumferential surface; 13a, 13b: side wall; 15: internal space of moving mold (melting pool); 20, 20B : casting chamber (housing); 21: top plate; 22: bottom plate; 25, 26: side plate; 27: door; 31: scrap 篓; 35: guide table roll set; 35a-35d: guide table roll; 37a, 37b : clamping roller; 40: door opening and closing device; 41: hinge; 42: bracket; 43: hook link; 50, 50A, 50B, 50C, 50D: sealing device; 51: inert gas supply source; 52: inert Gas supply pipe; 53: inert gas supply pump; 54a, 54b inert gas nozzle; 58b: air nozzle; 59: heat insulating material; 60: cooling device (cooling unit); 61: water supply source; 62: water supply pipe; 63: for Water pump; 64: water-cooled jacket; 67: drain pipe; 71, 72: inert gas feed pipe; 81: void portion; 90, 90A, 90B: control device; 100, 100A, 100B: continuous casting device; A1, A2: The direction of rotation of the casting roll; C1: the central axis of the casting roll; C2: the central axis of the casting roll; L1: the vertical line containing the central axis of the casting roll; L2: a vertical line including a central axis of the casting roll; L3: a line in the direction in which the inert gas is sprayed; and L4: a tangent line at the intersection of the line in the direction in which the inert gas is sprayed and the casting roll.

Claims

A sealing device for a pair of rollers and a space portion disposed between the pair of rollers and having an upper opening portion through which a thin strip that can be drawn between the pair of rollers passes Sealing,

The sealing device is characterized by having an inert gas nozzle that injects an inert gas toward a respective circumferential surface of the pair of rollers.
The sealing device of claim 1 wherein:

The inert gas nozzle is configured such that a line of an injection direction of the inert gas when viewed from a rotation axis direction of the roller, a line with a line of an injection direction of the inert gas, and a circumferential surface of the roller The tangent at the point formed on the side of the strip is less than 90 degrees.
A sealing device according to claim 1 or claim 2, wherein

There is also an air nozzle that is paired with the inert gas nozzle and disposed at an outer side of the pair of inert gas nozzles with respect to the thin strip, and to the pair The air is sprayed on the circumferential surface of the roller.
A sealing device according to claim 3, wherein

The air nozzle has an angle toward a side opposite to the strip side.
A sealing device according to any one of claims 1 to 4, wherein

The inert gas nozzle is a double nozzle or a slit nozzle,

The multiple nozzle has a plurality of nozzles opposed to the rollers and arranged side by side in the direction of the central axis of the roller,

The slit nozzle is provided with a plurality of slits opposed to the rollers and arranged side by side in the direction of the central axis of the roller, or is disposed to face the roller and extend across the central axis of the roller A slit formed by opening the direction as a whole.
A continuous casting apparatus characterized by having:

a pair of rollers;

a housing having an upper opening portion through which a thin strip that is drawn between the pair of rollers passes under the pair of rollers;

A sealing device according to any one of claims 1 to 5, which seals a gap between the pair of rollers and the casing.
A continuous casting apparatus according to claim 6, wherein

There is further provided a cooling unit that cools the casing by a refrigerant.
A continuous casting apparatus according to claim 6 or claim 7, wherein

An inert gas injection amount adjustment unit that adjusts an injection amount of the inert gas injected from the inert gas nozzle to bring an oxygen concentration in the casing to a predetermined oxygen concentration or lower .
A sealing method is a gap between a pair of rollers and a housing disposed under the pair of rollers and having an upper opening portion through which a thin strip that can be drawn between the pair of rollers passes Sealing method for sealing,

The sealing method is characterized in that

An inert gas is sprayed toward the respective circumferential surfaces of the pair of rolls by an inert gas nozzle, and the inert gas flows in the direction of the strip along the circumferential surface of the pair of rolls.