JP3991152B2 - Pinch roll gas seal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pinch roll gas seal device provided in a metal strip continuous casting apparatus. More specifically, the present invention relates to a pinch roll gas seal device provided in a twin roll type continuous casting machine, but is not limited thereto.
[0002]
[Prior art]
Conventionally, various twin roll type continuous casting machines have been proposed as one means for continuously casting a metal plate from molten metal.
[0003]
FIG. 9 shows a strip caster (a twin roll type continuous casting machine) disclosed in Japanese Patent Laid-Open Nos. 63-26240 and 63-30158. In the figure, reference numerals 1a and 1b denote a pair of internally cooled casting rolls, and the casting rolls 1a and 1b are arranged so as to be aligned horizontally and parallel to each other with a roll gap.
[0004]
A tundish 3 for forming a molten metal pool 2 between the casting rolls 1a and 1b is provided immediately above the casting rolls 1a and 1b, and the molten metal pool 2 is provided between the casting rolls 1a and 1b. When the casting roll 1a located on the left side in FIG. 9 is rotated clockwise while the casting roll 1b located on the right side in FIG. 9 is simultaneously rotated counterclockwise in the formed state, the casting rolls 1a and 1b are rotated simultaneously. The solidified metal is formed into a high-temperature strip 4 having a thickness corresponding to the roll gap of the casting rolls 1a and 1b, and continuously sent out below the casting rolls 1a and 1b.
[0005]
Reference numerals 5a and 5b denote a pair of pinch roll groups, and the pinch roll groups 5a and 5b are capable of holding the high-temperature strip 4 fed downward from the cast rolls 1a and 1b in the plate thickness direction so as to hold the cast rolls 1a and 1b. It is arranged immediately below. Reference numeral 6 denotes a strip guide member formed in a curved plate shape when viewed from the side. The strip guide member 6 is configured to pinch the strip 4 fed downward from the pinch roll groups 5a and 5b in the horizontal direction. It arrange | positions under the roll groups 5a and 5b.
[0006]
Reference numeral 7 denotes a pinch roll device having a pair of pinch rolls 7a and 7b. The pinch roll device 7 is adapted to hold the strip 4 guided in the horizontal direction by the strip guide member 6 in the plate thickness direction. The member 6 is disposed downstream of the strip moving direction.
[0007]
Reference numeral 8 denotes a winder, and the winder 8 is arranged on the downstream side of the pinch roll device 7 so as to wind up the strip 4 fed horizontally from the pinch rolls 7a and 7b.
[0008]
The above-described lower half portions of the casting rolls 1a and 1b, the pinch roll groups 5a and 5b, the strip guide member 6, the pinch rolls 7a and 7b, and the winder 8 are a large chamber (casing) 9 formed integrally as a whole. Inside the chamber 9, nozzles 10 a and 10 b are provided between the strip guide member 6 and the pinch rolls 7 a and 7 b so as to face the lower surface and the upper surface of the strip 4.
[0009]
A gas supply source 12 is connected to the nozzles 10a and 10b via supply pipes 11a and 11b, and a gas supply source 14 is connected to the chamber 9 via supply pipes 13a and 13b.
[0010]
That is, in the twin roll type continuous casting machine shown in FIG. 9, by supplying non-oxidizing gas such as nitrogen gas to the chamber 9, the inside of the chamber 9 is made non-oxidizing gas atmosphere. By spraying from 10b, the generation of scale (oxide film) on the surface of the strip 4 is suppressed.
[0011]
Further, the temperature of the strip 4 is about 1400 ° C. when it is fed from the casting rolls 1a and 1b, but is cooled to about 600 to 800 ° C. by being cooled by nitrogen gas injected from the nozzles 10a and 10b. It has come to be lowered.
[0012]
However, in the twin-roll type continuous casting machine shown in FIG. 9, the volume of the chamber 9 becomes very large. Therefore, it is difficult to maintain the interior of the chamber 9 in a non-oxidizing gas atmosphere. Scale may be generated on the surface, and when the strip 4 wound up by the winder 8 is taken out of the chamber 9, the chamber 9 is opened to the atmosphere. To be more. In addition, because nitrogen is expensive, operating costs are high.
[0013]
JP-A-9-174204 has been proposed as a method for reducing the above-mentioned problems. In this publication, as shown in FIG. 10, the upstream fixed chamber 16A surrounding the strip 4 between the casting rolls 1a and 1b and the pinch rolls 7a and 7b, the pinch rolls 7a and 7b, and the winding machine 8 are inserted. A downstream fixed chamber 16B surrounding the strip 4 between the pinch rolls 15a and 15b provided on the side is provided.
[0014]
In the fixed chambers 16A and 16B, a group of nozzles 18 are provided so that a controlled non-oxidizing gas 17 is ejected toward both sides of the strip 4, and a scale is formed on the strip 4 during operation of the apparatus. Is suppressed. Further, in the fixed chamber 16B on the downstream side of the pinch rolls 7a and 7b, a quenching medium that is liquid at room temperature for quenching the passing strip 4 so that the strip 4 exits the guide path at a temperature of 300 ° C. or lower. 19 is provided with a rapid cooling means. 6a is a catch roll, 20 is draining.
[0015]
In the above publication, a case where a rolling mill 21 as shown in FIG. 11 is provided between the pinch roll device 7 and the winder 8 is also illustrated. In this case, the fixed chamber provided on the downstream side of the pinch rolls 7a and 7b is divided before and after the work rolls 21a and 21b backed up by the backup rolls 21c and 21d of the rolling mill 21, and the downstream of the pinch rolls 7a and 7b. The fixed chamber 16B and the rear fixed chamber 16C on the exit side of the work rolls 21a and 21b. Reference numeral 21 'denotes a heating device for the strip 4 provided on the entry side of the work rolls 21a and 21b. In the example of FIG. 11, a rapid cooling means for spraying the rapid cooling medium 19 to the rear fixed chamber 16C is provided. In addition to the above example, the fixed chamber 16B on the downstream side may be provided until just before the entrance of the rolling mill 21, and the fixed chamber may not be provided on the exit side of the rolling mill 21.
[0016]
10 and 11, the pinch rolls 7a and 7b and the upstream fixed chamber 16A and the pinch rolls 7a and 7b and the downstream fixed chamber 16B are hermetically sealed on the outer peripheral surface of the pinch rolls 7a and 7b. The sealing member 22 is attached to the upstream fixed chamber 16A and the downstream fixed chamber 16B so as to be in contact with each other. As the seal member 22, a labyrinth seal or a wire seal formed by a large number of metal strands is applied.
[0017]
As shown in FIGS. 10 and 11, according to the configuration in which the guide path of the strip 4 is surrounded by the fixed chambers 16A, 16B, and 16C, the entire structure is covered with the integrally formed chamber 9 as shown in FIG. In comparison, the volume of each of the fixed chambers 16A, 16B, and 16C can be kept small, so that the amount of the non-oxidizing gas 17 used can be reduced.
[0018]
[Problems to be solved by the invention]
However, in FIGS. 10 and 11, it is necessary to maintain airtightness between the rotating pinch rolls 7a and 7b and the fixed chambers 16A and 16B. However, the sealing member 22 provided for this purpose is the outer periphery of the pinch rolls 7a and 7b. The surface of the pinch rolls 7a and 7b may be damaged due to the contact with the surface, and the strip 4 may have a pattern by roll transfer. Further, it is necessary to remove the seal member 22 from the fixed chambers 16A and 16B when replacing the roll. In order to avoid this problem, it is conceivable to form a gap between the pinch rolls 7a and 7b and the fixed chambers 16A and 16B. In this case, however, the consumption increases due to the discharge of the non-oxidizing gas 17. .
[0019]
Further, when the above-described fixed chambers 16A, 16B, and 16C are provided, generally, the pressure of the non-oxidizing gas 17 in the downstream fixed chambers 16B and 16C is set higher than the pressure in the upstream fixed chamber 16A. However, due to this pressure difference, the non-oxidizing gas 17 bypasses the shaft ends of the pinch rolls 7a and 7b and flows upstream along the guide path of the strip 4, and the consumption of the non-oxidizing gas 17 is thereby reduced. It was increasing.
[0020]
An object of the present invention is to provide a gas seal device for a pinch roll that eliminates the seal member that contacts the outer peripheral surface of the pinch roll and can reduce the consumption of non-oxidizing gas.
[0021]
[Means for Solving the Problems]
According to the present invention, a pinch roll device having a pair of upper and lower pinch rolls whose shaft portions are supported by a roll housing via a roll chock is provided in a moving path of a high-temperature strip, and is not provided in a fixed chamber surrounding the strip of the moving path. A gas seal device for the pinch roll in a metal strip continuous casting apparatus that suppresses the formation of scale on the strip by supplying an oxidizing gas, wherein the pinch portions of the upper and lower pinch rolls are provided between the roll chocks. The outer cover that surrounds the outer periphery and has a slight gap between the end of the pinch part and the roll surface, and the lower roll cover and the intermediate cover disposed between the upper and lower roll covers between the roll end face and the roll chock A roll chamber that can communicate with the fixed chamber, and upper and lower roll covers Gas sealing device pinch rolls, characterized in that a gas supply port for supplying the non-oxidizing gas, it relates to a.
[0022]
Preferably, the upper and lower roll covers and the intermediate cover include water cooling panels.
[0023]
Preferably, the method includes forming a gas curtain in which the non-oxidizing gas blown out from the gap between the end portion of the upper and lower roll covers and the roll surface forms the strip.
[0024]
Preferably, the upper and lower roll covers include a shaft cover portion that surrounds a shaft portion between the roll end surface and the roll chock.
[0025]
Preferably, the lower roll cover is supported by the housing, the intermediate cover is supported by the lower roll cover, and the upper roll cover is supported by the intermediate cover.
[0026]
Preferably, the lower roll cover includes being fixed to a roll chock at both ends of a lower pinch roll, one of which is movable in the axial direction.
[0027]
Preferably, the upper roll cover has a shape that allows the upper pinch roll to move up and down, and includes both ends of the upper roll cover provided with sealing devices that maintain airtightness with the roll chock.
[0028]
Preferably, the intermediate cover includes a slit substantially parallel to a line connecting the axis of the upper and lower pinch rolls, and further includes a gas supply port for supplying non-oxidizing gas through the slit. Forming a gas curtain that blocks the flow of non-oxidizing gas flowing in the line direction of the strip through the gap between the intermediate cover and the roll end surface.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Preferred embodiments of the invention will be described below with reference to the drawings.
[0030]
FIG. 1 is a cut front view illustrating an example of a gas seal device for a pinch roll according to the present invention, and FIG. 2 is a view taken in the direction of arrows II-II in FIG.
[0031]
As shown in FIGS. 10 and 11, in the configuration in which the pinch roll device 7 is provided in the moving path of the high temperature strip 4 and the fixed chambers 16 </ b> A and 16 </ b> B surrounding the high temperature strip 4 are provided before and after the pinch roll device 7. The pinch roll device 7 is configured as shown in FIGS.
[0032]
1 and 2, 51 is a roll housing, and a pair of upper and lower pinch rolls 52, 53 are rotatably supported by roll chocks 54a, 54b, 54c, 54d via a shaft portion 55 in the housing 51. Yes. One of the lower pinch rolls 53 (left side in FIG. 1) is fixed to the housing 51, and the other (right side in FIG. 1) roll chock 54c is supported so as to be movable in the axial direction with respect to the housing 51. Yes. One shaft portion 55 of the lower pinch roll 53 is fixed to the roll chock 54c by a fixed key 56, and the other shaft portion 55 is fixed to the roll chock 54d by a gap 57. It is supported to be movable in the direction.
[0033]
The roll chocks 54a and 54b that support both shaft portions 55 of the upper pinch roll 52 are supported so as to be movable up and down along the guides 58 of the housing 51, and the upper portion of the housing 51 is capable of extracting the roll chocks 54a and 54b upward. It is open. An upper member 59 is detachably attached to the opened upper portion of the housing 51.
[0034]
Roll internal cooling water supply / discharge pipes 60a and 60b are connected to shaft ends of the operation side (left side in FIG. 1) of the pinch rolls 52 and 53 via a rotary joint 61, and the pinch rolls 52 and 53 are connected to each other. A drive shaft is connected to a shaft end of the drive side (right side in FIG. 1) via a coupling (not shown).
[0035]
In the example of FIGS. 1 and 2, the housing 51 is configured to be shiftable on the rail 63 by a wheel 62 to the side (operating side) of the line of the strip 4. 51 is provided, and a lowering device 65 for raising and lowering and pressing the upper pinch roll 52 via the roll chocks 54a and 54b in the housing 51 is provided on the upper portion of the fixed housing 64. It has been. In FIG. 2, 64 a is a stopper for fixing the housing 51 located in the fixed housing 64 so as not to move by protruding inside the fixed housing 64.
[0036]
In the pinch roll device 7 described above, a roll chamber including upper and lower roll covers 66 and 67 and an intermediate cover 68 as shown in FIGS. 1 and 3 to 5 is provided.
[0037]
The upper and lower roll covers 66 and 67 have a rectangular shape surrounding the outer periphery excluding the pinch portion P of the pinch rolls 52 and 53 as shown in FIGS. The end portions 70a and 70b close to the pinch portion P form a slight gap with the roll surface. The gap formed in the end portions 70a and 70b is directed toward the strip 4. Further, the upper and lower roll covers 66 and 67 have a rectangular shape so as to surround the shaft portion 55 between the roll end surface 71 and the roll chocks 54a, 54b, 54c and 54d as shown in FIGS. The shaft cover portion 72 is formed so as to protrude.
[0038]
The intermediate cover 68 is disposed between the upper and lower roll covers 66 and 67 between the roll end surface 71 of the pinch rolls 52 and 53 and the roll chocks 54a, 54b, 54c and 54d.
[0039]
The lower roll cover 67 is supported by the housing bottom surface 51 a, the intermediate cover 68 is bolted on the lower roll cover 67, and the upper roll cover 66 is bolted on the intermediate cover 68. As described above, the pinch rolls 52 and 53 are surrounded by the roll chamber including the upper and lower roll covers 66 and 67 and the intermediate cover 68, but are in contact with both the upper and lower roll covers 66 and 67 and the intermediate cover 68. Absent.
[0040]
The upper and lower roll covers 66 and 67 and the intermediate cover 68 are constituted by a water cooling panel having a cooling liquid channel 69 therein as shown in FIGS. The coolant is supplied to and discharged from 69 through a liquid supply port 73 and a liquid discharge port 74 as shown in FIGS. In the figure, 76 is a mist supply port to the lubrication header for supplying lubrication mist to the surface of the pinch rolls 52 and 53.
[0041]
Further, the upper and lower roll covers 66 and 67 are provided with a gas supply port 75 for supplying non-oxidizing gas. By supplying non-oxidizing gas from the gas supply port 75, the upper and lower roll covers 66 and 67 are provided. Non-oxidizing gas is blown out from the gap between the ends 70a, 70b of the covers 66, 67 and the roll surface to form a non-oxidizing gas curtain 77 (FIG. 4) toward the strip.
[0042]
The lower roll cover 67 supported on the housing bottom surface 51a has shaft cover portions 72 at both ends fixed to the roll chocks 54c and 54d by bolts, whereby the airtightness between the lower roll cover 67 and the roll chocks 54c and 54d is secured. Is held. At this time, thermal expansion and contraction of the lower roll cover 67 is permitted by sliding the roll chock 54d that can move in the axial direction. Further, the thermal expansion and contraction of the lower pinch roll 53 is allowed by the shaft portion 55 sliding in the axial direction through the gap 57 with respect to the roll chock 54d.
[0043]
The upper roll cover 66 has a shape that allows the upper pinch roll 52 to move up and down as shown in FIGS. 3 and 4, and at both ends of the upper roll cover 66, that is, at the end of the shaft cover portion 72. As shown in FIG. 6, a packing material 78 surrounding the shaft cover portion 72 is disposed, and the packing material 78 is pressed against the roll chocks 54a and 54b via a spring 79, thereby sealing between the roll chocks 54a and 54b. The sealing device 80 is provided. At this time, thermal expansion / contraction of the upper roll 52 and thermal expansion / contraction of the upper roll cover 66 are allowed separately.
[0044]
Further, the intermediate cover 68 is formed with a vertical slit 81 substantially parallel to a line connecting the axial centers of the upper and lower pinch rolls 52 and 53, and for supplying non-oxidizing gas through the slit 81. A gas supply port 82 is provided, and a non-oxidizing gas is ejected from the gas supply port 82 toward the roll end surface 71, thereby flowing through the gap between the intermediate cover 68 and the roll end surface 71 in the line direction of the strip 4. A gas curtain 77 that blocks the flow of the oxidizing gas is formed.
[0045]
2 and 7, fixed chambers 16A and 16B similar to those in FIGS. 10 and 11 are fixed to the fixed housing 64, and a strip as shown in FIG. 4 is provided with an elongate opening 83 surrounding the strip 4, and an outlet member 86 having an elongate opening 85 surrounding the strip 4 is also provided on the exit side of the strip 4. 7 is provided with a seal material 87 for hermetically communicating the lower roll covers 66 and 67 and the intermediate cover 68 in addition to the roll chamber as shown in FIG. The fixed chambers 16A and 16B, the inlet member 84, and the outlet member 86 are also constituted by a water-cooled panel provided with the coolant channel 69 therein as described above. The seal material 87 is pressed against the covers 66, 67, 68 by the driving device 87a, and when the roll is replaced, the seal material 87 is retracted to provide a gap so that the roll housing 51 can be pulled out.
[0046]
The operation of the above embodiment will be described below.
[0047]
When the high temperature strip 4 is transported by the pinch roll device 7 of FIGS. 1 and 2, the coolant is supplied to the coolant flow channels 69 of the upper and lower roll covers 66 and 67 and the intermediate cover 68 and the fixed chambers 16A and 16B. Cool by supplying and discharging. At the same time, a non-oxidizing gas is supplied into the fixed chambers 16A and 16B to maintain the non-oxidizing gas atmosphere, and non-oxidizing is performed from the gas supply ports 75 and 82 provided in the upper and lower roll covers 66 and 67 and the intermediate cover 68. Supply gas.
[0048]
The non-oxidizing gas supplied from the gas supply port 75 to the upper and lower roll covers 66 and 67 is blown out from the gap between the end portions 70a and 70b of the upper and lower roll covers 66 and 67 and the roll surface. A non-oxidizing gas curtain 77 (FIG. 4) is formed.
[0049]
When the pressure of the non-oxidizing gas in the downstream fixed chamber 16B shown in FIGS. 2 and 7 is set higher than the pressure in the upstream fixed chamber 16A, the upstream side along the line of the strip 4 due to the pressure difference. Try to flow into.
[0050]
However, by forming a non-oxidizing gas curtain 77 toward the strip 4 as shown in FIG. 4, the flow of non-oxidizing gas flowing in the direction along the line of the strip 4 is blocked.
[0051]
The non-oxidizing gas supplied from the gas supply port 82 to the intermediate cover 68 forms a vertical gas curtain 77 from the slit 81 formed perpendicularly to the intermediate cover 68 toward the roll end surface 71, thereby the intermediate cover 68 and the roll end surface. The flow of the non-oxidizing gas flowing in the line direction of the strip 4 through the gap with 71 is blocked.
[0052]
The lower roll cover 67 is sealed by fixing the end portions thereof to the roll chocks 54c and 54d, and the upper roll cover 66 is sealed between the roll chocks 54a and 54b by a sealing device 80.
[0053]
As described above, since the roll chamber is configured and the lower roll covers 66 and 67 and the intermediate cover 68 surround the pinch rolls 52 and 53 without contacting the pinch rolls 52 and 53, the pinch rolls 7a and 7b are included. In addition, the upper and lower roll covers 66 and 67 surround the pinch rolls 52 and 53 with a minimum volume and have an airtight structure. The amount of gas consumed for maintaining the non-oxidizing gas atmosphere can be reduced.
[0054]
Furthermore, the problem of the non-oxidizing gas flowing in the direction along the line of the strip 4 due to the pressure difference between the fixed chambers 16A and 16B can be prevented by the gas curtain 77, so that the consumption of non-oxidizing gas can be greatly reduced.
[0055]
The present invention is not limited only to the above-described embodiments, and the shape and structure of the upper and lower roll covers and the intermediate cover can be changed variously, and various changes can be made without departing from the scope of the present invention. Of course, it can be added.
[0056]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects.
[0057]
The upper and lower roll covers constituting the roll chamber surround the pinch roll without contacting the pinch roll, so that the problem of scratches on the surface of the pinch roll can be prevented. Since the pinch roll surrounds the pinch roll with a minimum volume and has an airtight structure, the amount of gas consumed for maintaining the inside of the roll chamber in a non-oxidizing gas atmosphere can be reduced.
[0058]
The problem of non-oxidizing gas flowing in the direction along the strip line due to the pressure difference of the fixed chamber can be prevented by the gas curtain, so that the consumption of non-oxidizing gas can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a cut front view showing an example of a gas seal device for a pinch roll according to the present invention.
FIG. 2 is a view taken in the direction of arrows II-II in FIG.
3 is a view taken in the direction of arrows III-III in FIG.
4 is a view taken in the direction of arrows IV-IV in FIG. 1;
FIG. 5 is a view in the direction of the arrow V in FIG. 1;
6 is an enlarged view of a portion VI in FIG. 1. FIG.
FIG. 7 is a side view of a fixed chamber fixed to a fixed housing.
8 is a VIII-VIII direction arrow view of FIG. 7;
FIG. 9 is an overall schematic side view showing an example of a conventional strip caster.
FIG. 10 is an overall schematic side view showing another example of a conventional strip caster.
FIG. 11 is an overall schematic side view showing still another example of a conventional strip caster.
[Explanation of symbols]
4 Hot strip (strip)
7 Pinch roll device 16A Upstream fixed chamber 16B Downstream fixed chamber 51 Housing 52 Upper pinch roll 53 Lower pinch rolls 54a, 54b, 54c, 54d Roll chock 55 Shaft 66 Upper roll cover 67 Lower roll cover 68 Intermediate cover 69 Cooling Liquid flow path 70a, 70b End portion 71 Roll end surface 72 Shaft cover portion 75 Gas supply port 77 Gas curtain 80 Sealing device 81 Slit 82 Gas supply port P Pinch portion

Claims (8)

A pinch roll device having a pair of upper and lower pinch rolls whose shafts are supported by a roll housing via a roll chock is provided in the moving path of the hot strip, and supplies non-oxidizing gas into a fixed chamber surrounding the strip of the moving path. A gas seal device for the pinch roll in a metal strip continuous casting apparatus that suppresses the formation of scale on the strip, and surrounds the outer periphery excluding the pinch portion of the upper and lower pinch rolls between the roll chocks. The end portion close to the pinch portion has a slight gap between the roll surface, the lower roll cover, and an intermediate cover disposed between the upper and lower roll covers between the roll end surface and the roll chock. A roll chamber that can communicate with the fixed chamber is provided, and the upper and lower roll covers have non-oxidized gas. Gas sealing device pinch rolls, characterized in that it is provided a gas supply port for supplying. 2. The pinch roll gas seal device according to claim 1, wherein the upper and lower roll covers and the intermediate cover are constituted by water-cooled panels. 2. A gas seal device for a pinch roll according to claim 1, wherein a non-oxidizing gas blown from a gap between an end portion of the upper and lower roll covers and a roll surface forms a gas curtain directed to the strip. The pinch roll gas seal device according to claim 1, wherein the upper and lower roll covers include a shaft cover portion that surrounds a shaft portion between a roll end face and a roll chock. The pinch roll gas seal device according to claim 1, wherein the lower roll cover is supported by a housing, the intermediate cover is supported by the lower roll cover, and the upper roll cover is supported by the intermediate cover. The pinch roll gas seal device according to claim 1, wherein one of the lower roll covers is fixed to a roll chock at both ends of the lower pinch roll which is movable in the axial direction. The upper roll cover has a shape that allows the upper pinch roll to move up and down, and is provided with a sealing device that maintains airtightness between the upper roll cover and the roll chock at both ends. 5. A gas seal device for pinch rolls according to 1 or 4. The intermediate cover includes a slit substantially parallel to a line connecting the upper and lower pinch rolls and a gas supply port for supplying non-oxidizing gas through the slit, and is ejected from the gas supply port. 2. A pinch roll according to claim 1, wherein the non-oxidizing gas forms a gas curtain that blocks the flow of non-oxidizing gas flowing in the line direction of the strip through the gap between the intermediate cover and the roll end face. Gas seal device.

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