JP2007138208A - Liquid-wiping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid-wiping device which can surely prevent air in atmosphere from entering into the device by improving the sealing properties. <P>SOLUTION: This liquid wiping device comprises a seal box 8 formed so as to be filled with a non-oxidative gas G different from air in atmosphere when the bottom end is immersed in a molten metal plating bath 5, and so as to surround a steel sheet S raised from the molten metal plating bath 5; and a pair of nozzles 25a and 25b which are arranged into a multistage form in a transportation direction at an appearance side of an opening 9 so as to face each other, sandwich the steel sheet S discharged from the seal box 8 and approach or come off according to a thickness of the steel sheet S, and wipe a plating liquid M by jetting the non-oxidative gas G different from air in atmosphere to the steel sheet S through the nozzles 25a and 25b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid wiping apparatus.

  In general, a steel sheet production line is provided with a plating process for plating the surface of a steel sheet after a rolling process, a pickling process, an annealing process, and the like. In this plating step, after the steel plate is continuously immersed from above in the molten metal plating bath, the steel plate is further turned upward by a sink roll provided in the molten metal plating bath, Plating is performed by wiping in this ascending process. A liquid wiping device is used during this wiping.

  The liquid wiping device allows a steel plate continuously pulled up from a molten metal plating bath to pass between a pair of opposing wipers (nozzles) and to inject a high-pressure non-oxidizing gas to perform wiping. The excess of the plating solution adhering to the surface is scraped off to adjust the thickness of the plating layer. The surface from the surface of the molten metal plating bath to the wiping point is maintained in an inert atmosphere, thereby preventing the plating solution from being oxidized.

  Such a conventional liquid wiping apparatus is disclosed in Patent Document 1, for example.

No. 8-356

  However, in the conventional liquid wiping device, the nozzles do not face each other if the installation accuracy of the wiper is poor, so when non-oxidizing gas is injected, it tends to be negative pressure near the non-oxidizing gas of the steel plate, Sealing performance is deteriorated at both ends of the steel plate. As a result, when the non-oxidizing gas injected from the nozzle collides with the steel sheet and then flows along the direction of conveyance of the steel sheet, the air enters in the opposite direction and the concentration of the inert atmosphere decreases. Oxide is generated and adhered, that is, the quality of the steel sheet may be affected.

  Accordingly, an object of the present invention is to provide a liquid wiping device that solves the above-described problems and can reliably prevent the intrusion of an external atmosphere by improving the sealing performance.

A liquid wiping apparatus according to a first invention for solving the above-described problem is
The lower end is immersed in a liquid bath to form a seal box filled with a gas different from the outside atmosphere so as to surround the strip that has been pulled up after being immersed in the liquid bath,
A pair of nozzles arranged oppositely so as to approach and separate in accordance with the thickness of the strip plate across the strip plate discharged from the seal box is provided in multiple stages in the transport direction on the exit side of the opening of the seal box ,
A liquid different from an external atmosphere is jetted from the nozzle toward the band plate to wipe the liquid.

A liquid wiping apparatus according to a second invention for solving the above-mentioned problems is as follows.
In the liquid wiping apparatus according to the first invention,
The gas injected from the nozzle flowing into the seal box is cooled to remove the vaporized component of the liquid and then used as the atmospheric gas for the pretreatment process, while the heat deprived during the cooling of the gas is newly supplied. It is transmitted to the gas to be ejected from the nozzle.

A liquid wiping apparatus according to a third invention for solving the above-described problem is
In the liquid wiping apparatus according to the first invention,
The gas injected from the nozzle flowing into the seal box is cooled to remove the vaporized component of the liquid, while the heat taken away during the cooling of the gas is transferred to the newly supplied gas, and the heat transferred The gas is jetted from the nozzle together with the gas from which the vaporized component has been removed.

A liquid wiping device according to a fourth aspect of the present invention for solving the above problem is as follows.
A seal box filled inside with a gas different from the outside atmosphere is placed above the liquid bath,
A pair of nozzles arranged opposite to each other so as to approach and separate in accordance with the thickness of the strip plate across the strip plate that is pulled up after being immersed in the liquid bath is multi-staged in the transport direction on the entrance side of the carry-in entrance of the seal box Provided,
A liquid different from an external atmosphere is jetted from the nozzle toward the band plate to wipe the liquid.

A liquid wiping apparatus according to a fifth invention for solving the above-described problems is
In the liquid wiping device according to any one of the first to fourth inventions,
A side seal block is provided between the pair of nozzles so as to approach and separate according to the width of the strip.

  According to the liquid wiping apparatus according to the first aspect of the invention, the belt is pulled up after being immersed in the liquid bath with the seal box filled with a gas different from the outside atmosphere by being immersed in the liquid bath at the lower end. A pair of nozzles, which are formed so as to surround the plate and are arranged so as to approach and separate according to the thickness of the strip plate with the strip plate discharged from the seal box interposed therebetween, are provided at the opening of the seal box. By providing a multi-stage in the transport direction on the side and wiping the liquid by injecting a gas different from the external atmosphere toward the band plate from the nozzle, the sealing performance can be improved, so that the inside of the seal box Intrusion of the external atmosphere can be reliably prevented.

  According to the liquid wiping device of the second invention, in the liquid wiping device of the first invention, the gas jetted from the nozzle that has flowed into the seal box is cooled and the vaporized component of the liquid is removed. While being used as an atmospheric gas in the processing step, the heat taken during cooling of the gas is transferred to the newly supplied gas and injected from the nozzle, so that the sealing performance can be improved. Intrusion of the external atmosphere into the box can be reliably prevented, and the running cost can be reduced by heat recovery and effective use of gas.

  According to the liquid wiping apparatus according to the third aspect of the invention, in the liquid wiping apparatus according to the first aspect of the invention, the gas injected from the nozzle that has flowed into the seal box is cooled to remove the vaporized component of the liquid, It is possible to improve the sealing performance by transferring the heat taken during cooling of the gas to the newly supplied gas and injecting the heat transferred gas from the nozzle together with the gas from which the vaporized component has been removed. Therefore, it is possible to reliably prevent the outside atmosphere from entering the seal box, and to reduce the running cost by heat recovery and gas reuse.

  According to the liquid wiping apparatus according to the fourth aspect of the invention, the seal box filled inside with a gas different from the external atmosphere is disposed above the liquid bath, and the strip is pulled up after being immersed in the liquid bath. A pair of nozzles arranged facing each other so as to approach and separate according to the thickness of the strip is provided in multiple stages in the transport direction on the entrance side of the seal box, and a gas different from the external atmosphere toward the strip Since the sealing property can be improved by wiping the liquid by ejecting the liquid from the nozzle, it is possible to reliably prevent the external atmosphere from entering the seal box.

  According to the liquid wiping device of the fifth invention, in the liquid wiping device according to any one of the first to fourth inventions, the side seal block that approaches and separates according to the width of the band plate between the pair of nozzles. By providing this, it is possible to improve the sealing performance at both ends of the band plate.

  Hereinafter, a liquid wiping apparatus according to the present invention will be described in detail with reference to the drawings. 1 is a schematic cross-sectional view of a molten metal plating facility equipped with a liquid wiping apparatus according to a first embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the liquid wiping apparatus, FIG. 3 is a plan cross-sectional view of FIG. Is a schematic sectional view of a molten metal plating facility equipped with a liquid wiping device according to a second embodiment of the present invention, FIG. 5 is a schematic sectional view of a coating facility equipped with a liquid wiping device according to a third embodiment of the present invention, FIG. 6 is a schematic sectional view of an annealing furnace equipped with a liquid wiping apparatus according to a fourth embodiment of the present invention.

  First, a molten metal plating facility equipped with a liquid wiping apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the steel sheet S is continuously supplied from the annealing furnace 1 to the molten metal plating facility 2. A transport roll 3 is rotatably provided in the annealing furnace 1, and a transport passage 4 is formed on the downstream side in the rotation direction of the transport roll 3. Then, the conveying passage 4 communicates with the inside of the molten metal plating bath 5 of the molten metal plating facility 2 so that the inside of the annealing furnace 1 is filled with non-oxidizing, reducing or weakly oxidizing non-oxidizing gas G and is inert. The atmosphere is kept.

  On the other hand, a molten metal plating bath 5 in which a plating solution M is stored is provided at the lower part of the molten metal plating facility 2. In the molten metal plating bath 5, the sink roll 6 that conveys the steel plate S to be conveyed substantially upward in the vertical direction, and the steel plate S conveyed from the sink roll 6 is corrected to the upper side of the molten metal plating apparatus 2. A pair of upper and lower correction rolls 7 to be conveyed are rotatably provided.

  A seal box 8 is provided above the molten metal plating bath 5. The lower end of the seal box 8 is immersed in the molten metal plating bath 5, whereby the inside of the seal box 8 is filled with a non-oxidizing, reducing or weakly oxidizing non-oxidizing gas G and kept in an inert atmosphere. ing. An opening 9 is opened on the upper surface of the seal box 8, and an exhaust port 10 is formed on the side wall thereof.

  Furthermore, a liquid wiping device 12 is provided above the seal box 8 via a seal material 11. The liquid wiping device 12 is covered with a noise reduction casing 13, and an opening 14 is opened on the upper surface of the noise reduction casing 13. A pair of vibration damping devices 15 are provided above the opening 14 so as to be opposed to each other with the steel plate S being conveyed therebetween.

  The exhaust port 10 communicates with the inside of the annealing furnace 1 through the vaporized metal component removing means 16. On the other hand, the liquid wiping device 12 is communicated with the wiping gas supply device 18 via the vaporized metal component removing means 16 and the heating means 17.

  Next, the liquid wiping device 12 will be described in detail with reference to FIGS. As shown in FIGS. 2 and 3, the liquid wiping device 12 includes a pair of wipers 21 and a pair of side seal blocks 22. The wipers 21 are supported in a movable manner so as to face each other in the thickness direction of the steel sheet S and to approach and separate from each other. On the other hand, the side seal blocks 22 are opposed to each other in the plate width direction of the steel plate S and are supported so as to be movable toward and away from each other. That is, the wiper 21 and the side seal block 22 can move on the sealing material 11 according to the plate thickness (plating film thickness) and plate width of the steel plate S. Note that the arrows shown in FIG. 3 indicate the moving directions of the wiper 21 and the side seal block 22.

  The wiper 21 includes a pair of casings 23 that are disposed on the upper portion of the sealing material 11 and that face each other in the thickness direction of the steel plate S. A chamber 24 that extends in the plate width direction is formed in the casing 23. ing. The chamber 24 is connected to the above-described wiping gas supply device 18 through the vaporized metal component removing unit 16 and the heating unit 17. An upper slit nozzle 25a and a lower slit nozzle 25b extending beyond the plate width are formed inside the chamber 24 (on the steel sheet S side).

  Therefore, by making the above-described configuration, the steel sheet S conveyed into the annealing furnace 1 is annealed in an inert atmosphere, and then conveyed into the molten metal plating bath 5 through the conveyance path 4 by the rotation of the conveyance roll 3. Is done. Then, the steel sheet S conveyed into the molten metal plating bath 5 is pulled up substantially vertically by the sink roll 6, and after the plating solution M adheres to the surface thereof, it is corrected between the correction rolls 7. Next, the steel sheet S to which the plating solution M is adhered is conveyed between the wiper 21 and the side seal block 22 from the opening 9, and is wiped by the non-oxidizing gas G injected from the slit nozzles 25a and 25b. The excessively deposited plating solution M is scraped off and plating with a predetermined film thickness is performed. At this time, the wiper 21 and the side seal block 22 are previously arranged at predetermined positions according to the conveying speed of the steel plate S, the plate thickness, the plate width, the plating film thickness, and the like. Thereafter, the plated steel sheet S is discharged from the opening 14 and conveyed to the next process.

  At the time of wiping, wind noise is generated by the injection of the non-oxidizing gas G. However, since the liquid wiping device 12 is covered with the noise reduction casing 13, these noises do not leak to the outside. Further, during conveyance, vibration is generated in the steel sheet S due to annealing, plating, and wiping, but the vibration is reduced by the vibration damping device 15. Moreover, since the vibration damping device 15 is provided immediately after the exit side of the molten metal plating facility 2 (liquid wiping device 12), that is, immediately before the entry side of the next process, the work in the next process is hindered by vibration. Absent.

  Next, spraying and circulation of the non-oxidizing gas G during wiping will be described. Heat is transmitted to the non-oxidizing gas G fed by the wiping gas supply device 18 by passing through a vaporized metal component removing means 16 described later, and further heated to a predetermined temperature by passing through the heating means 17. The heated non-oxidizing gas G is supplied into the chamber 24 of the wiper 21 and is injected toward the steel sheet S from the slit nozzles 25a and 25b. The non-oxidizing gas G sprayed from the slit nozzles 25a and 25b collides with the steel sheet S, and then flows upward and downward along the steel sheet S.

  Here, the non-oxidizing gas G sprayed from the upper slit nozzle 25a and flowing upward is discharged from the opening 14 together with the steel plate S to be conveyed. On the other hand, the non-oxidizing gas G injected downward from the lower slit 25b flows into the seal box 8 and maintains the inside of the seal box 8 in an inert atmosphere. The non-oxidizing gas G injected from the upper slit nozzle 25a and flowing downward and the non-oxidizing gas G injected from the lower slit nozzle 25b and flowing upward are surrounded by the steel plate S and the wiper 21. And a static pressure is generated in the space, and the static pressure holding portion P is formed. Since the static pressure holding part P becomes higher than the pressure in the atmosphere, which is the external atmosphere of the molten metal plating facility 2, and in the seal box 8, the intrusion of the atmosphere from the opening 14 and the non-oxidation from the opening 9 The discharge of the gas G is prevented.

  That is, the atmosphere is sealed by the non-oxidizing gas G injected from the upper slit nozzle 25a and flowing upward, and the plating solution M is wiped by the non-oxidizing gas G injected from the lower slit nozzle 25b and flowing downward. On the other hand, the static pressure holding part P is formed by the non-oxidizing gas G injected from the upper slit nozzle 25a and flowing downward, and the non-oxidizing gas G injected from the lower slit nozzle 25b and flowed upward, thereby providing a sealing property. Has improved. Thereby, the intrusion of the atmosphere can be prevented, and since the bath surface of the molten metal plating bath 5 to the wiping point is maintained in an inert atmosphere, the plating solution M is prevented from being oxidized.

  Moreover, since the side seal block 22 is arranged according to the plate width of the steel plate S, the static pressure holding portion P can be formed in a space surrounded by both ends of the steel plate S and the side seal block 22. The sealability on both sides of the steel sheet S is also improved.

  Then, the non-oxidizing gas G flowing into the seal box 8 is exhausted from the exhaust port 10 and supplied to the annealing furnace 1 through the vaporized metal component removing means 16. At this time, the exhausted non-oxidizing gas G contains a component in which a part of the molten metal plating bath 5 (plating solution M) is vaporized. Therefore, the vaporized metal component removing means 16 cools the exhausted non-oxidizing gas G below the boiling point of the plating solution M, thereby removing the vaporized component of the plating solution M as a solid. Thereby, since the purified non-oxidizing gas G can be supplied into the annealing furnace 1, the inside of the annealing furnace 1 is not contaminated with the vaporized component of the plating solution M.

  Further, the heat removed from the exhausted non-oxidizing gas G in the vaporized metal component removing means 16 is transmitted to the non-oxidizing gas G fed from the wiping gas supply device 18. Thereby, the load of the heating means 17 is reduced.

  Therefore, according to the liquid wiping apparatus according to the present invention, the wiper 21 and the side seal block 22 are provided on the exit side of the opening 9 of the seal box 8, and the slit nozzles 25a and 25b are provided in the transport direction to provide a static pressure holding unit. By forming P, not only wiping can be performed, but also the sealing performance can be improved, so that the intrusion of the atmosphere from the opening 14 and the discharge of the non-oxidizing gas G from the opening 9 can be prevented. Can do. Further, since the side seal blocks 22 are provided on both sides of the steel plate S, the sealing performance can be improved at both ends of the steel plate S. In addition, since wiping and sealing can be performed at the same time, it is not necessary to provide a dedicated nozzle for sealing in the seal box as in a conventional liquid wiping device, for example, and a simple configuration can be achieved.

  Further, by cleaning the exhausted non-oxidizing gas G and supplying it to the annealing furnace 1, the non-oxidizing gas G for wiping gas can be used also as the annealing gas. In addition to the simple configuration, consumption of the non-oxidizing gas G can be suppressed. And since the heat | fever generate | occur | produced at the time of the cleaning of the exhausted non-oxidized gas G is transmitted to the newly supplied non-oxidized gas G, the load of the heating means 17 can be reduced.

  A molten metal plating facility equipped with a liquid wiping apparatus according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in 1st Example, and description is abbreviate | omitted.

  As shown in FIG. 4, the steel sheet S is continuously shared from the annealing furnace 1 to the molten metal plating facility 31. The molten metal plating bath 5 is rotatably provided with a dipping roll 32 that conveys the steel plate S to be conveyed substantially upward in the vertical direction. The dipping roll 32 is supported by a bearing (not shown), and this bearing is provided above the molten metal plating bath 5. In addition, a pair of blades 33 are provided on the exit side of the opening 9 of the seal box 8 with the steel plate S being conveyed therebetween. The blade 33 is supported at a predetermined angle with the steel plate S.

  Further, the liquid wiping device 12 is covered with a heat insulating material 34, and an opening 35 is opened on the upper surface of the heat insulating material 34. In the wiper 21, an intermediate slit nozzle 25c is formed between the slit nozzles 25a and 25b. A pressure increasing means 36 is provided between the heating means 17 and the wiping gas supply device 18, and the exhaust port 10 is connected to the wiping gas supply device 18 and the pressure increasing means 36 via the vaporized metal component removing means 16. Connected upstream.

  Therefore, by making the above-described configuration, the steel sheet S conveyed into the molten metal plating bath 5 is pulled up substantially vertically by the immersion roll 32, and the plating solution M is attached to the surface thereof. And the steel plate S is conveyed between the braid | blades 33, and the excess plating solution M of the surface is scraped off temporarily (wiping). Next, the primarily wiped steel sheet S is conveyed from the opening 9 between the wipers 21 and between the side seal blocks 22. Here, by further wiping with the non-oxidizing gas G sprayed from the slit nozzles 25a, 25b, and 25c, the excessively deposited plating solution M is scraped off and plating with a predetermined film thickness is performed. Is given. In addition, since the bearing of the immersion roll 32 is installed outside the molten metal plating bath 5, deterioration of the bearing is suppressed.

  Then, the non-oxidizing gas G pumped by the wiping gas supply device 18 is transferred with heat by passing through the vaporized metal component removing means 16 and is boosted by passing through the boosting means 36. By passing, it is heated to a predetermined temperature. The pressure-reduced and heated non-oxidizing gas G is supplied into the chamber 24 of the wiper 21, but since the wiper 21 is covered with the heat insulating material 34, the temperature of the supplied non-oxidizing gas G is almost lowered. There is nothing to do. The non-oxidizing gas G is jetted toward the steel sheet S from the slit nozzles 25a, 25b, and 25c and collides, and then flows upward and downward along the steel sheet S.

  Here, the non-oxidizing gas G sprayed from the upper slit nozzle 25a and flowing upward is discharged from the opening 14 together with the steel plate S to be conveyed. On the other hand, the non-oxidizing gas G injected downward from the lower slit 25b flows into the seal box 8 and maintains the inside of the seal box 8 in an inert atmosphere. Further, the non-oxidizing gas G injected from the intermediate slit nozzle 26c and flowing upward generates a static pressure together with the non-oxidizing gas G injected from the upper slit nozzle 25a and flowing downward to form a static pressure holding portion P1. Let On the other hand, the non-oxidizing gas G injected from the intermediate slit nozzle 26c and flowing downward generates static pressure together with the non-oxidizing gas G injected from the lower slit nozzle 25b and flowing upward to form a static pressure holding part P2. Let Thereby, the intrusion of air from the opening 35 and the discharge of the non-oxidizing gas G from the opening 9 are prevented.

  That is, the atmosphere is sealed by the non-oxidizing gas G injected from the upper slit nozzle 25a and flowing upward, and the plating solution M is wiped by the non-oxidizing gas G injected from the lower slit nozzle 25b and flowing downward. On the other hand, the non-oxidizing gas G injected downward from the upper slit nozzle 25a and the non-oxidizing gas G injected upward from the intermediate slit nozzle 25c form the static pressure holding portion P1, and the intermediate slit By forming the static pressure holding portion P2 with the non-oxidizing gas G injected from the nozzle 25c and flowing downward and the non-oxidizing gas G injected from the lower slit nozzle 25b and flowing upward, the sealing performance is improved. ing. Thereby, the intrusion of the atmosphere can be prevented, and since the bath surface of the molten metal plating bath 5 to the wiping point is maintained in an inert atmosphere, the plating solution M is prevented from being oxidized.

  Moreover, since the side seal block 22 is arranged according to the plate width of the steel plate S, the static pressure holding portion P can be formed in a space surrounded by both ends of the steel plate S and the side seal block 22. The sealability on both sides of the steel sheet S is also improved.

  The non-oxidizing gas G flowing into the seal box 8 is exhausted from the exhaust port 10, cleaned by passing through the vaporized metal component removing means 16, and supplied downstream of the wiping gas supply device 18. On the other hand, the non-oxidizing gas G fed from the wiping gas supply device 18 is transferred by passing through the vaporized metal component removing means 16 and merged with the cleaned non-oxidizing gas G. Next, the joined non-oxidizing gas G is pressurized and heated, and is injected from the slit nozzles 25a, 25b, and 25c.

  Therefore, according to the liquid wiping device of the present invention, the wiper 21 and the side seal block 22 are provided on the exit side of the opening 9 of the seal box 8, and the slit nozzles 25a, 25b, and 25c are provided in the transport direction to provide a static pressure. By forming the holding portions P1 and P2, not only wiping can be performed, but also the sealing performance can be improved, so that the intrusion of the atmosphere from the opening 35 and the discharge of the non-oxidizing gas G from the opening 9 Can be prevented. Further, since the side seal blocks 22 are provided on both sides of the steel plate S, the sealing performance can be improved at both ends of the steel plate S.

  Further, since the exhaust port 10 is connected to the downstream side of the wiping gas supply device 18, the exhausted non-oxidizing gas G is circulated and used, and the non-oxidizing gas G is wiped by the amount discharged from the opening 35. Since it should just supply from the gas supply apparatus 18, not only the whole manufacturing line of the steel plate S can be made a simple structure, but consumption of the non-oxidizing gas G can be suppressed. Thereby, the load of the wiping gas supply apparatus 18 can be reduced. Further, since the temperature of the circulating non-oxidizing gas G is lowered by the non-oxidizing gas G supplied from the wiping gas supply device 18, the load on the booster 36 can be reduced.

  In the present embodiment, the slit nozzles 25a, 25b, and 25c are configured in three stages. However, the slit nozzles 25a, 25b, and 25c may be configured in four or more stages so that the static pressure holding portions P are formed in multiple stages.

  The coating equipment provided with the liquid wiping apparatus according to the third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in 1st Example, and description is abbreviate | omitted.

  The coating equipment 41 shown in FIG. 5 is an apparatus for coating the steel sheet S that is continuously conveyed using the harmful paint N. A paint bath 42 in which the paint N is stored is provided at the lower part of the coating equipment 41, and the seal box 8 and the liquid wiping device 12 are provided at the upper part of the paint bath 42. A pressurizing means 43 is connected to the chamber 24, and the exhaust port 10 is connected to the post-processing equipment 44.

  Therefore, by making the above-described configuration, the steel sheet S transported into the paint bath 42 is pulled upward substantially in the vertical direction, so that the paint N adheres to the surface thereof. Then, the steel sheet S to which the paint has adhered is conveyed between the wipers 21 and between the side seal blocks 22 (see FIG. 3). At this time, the gas A whose pressure has been increased and raised by the pressurizing means 43 is pumped and the gas A is injected from the slit nozzles 25a and 25b, so that the excessively applied paint N is scraped off, and a predetermined amount is obtained. Painted with film thickness. In addition, as described above, the static pressure holding portion P is formed by the gas A that has flowed downward from the upper slit nozzle 25a and the gas A that has flowed upward from the lower slit nozzle 25b, so that the seal Is improved.

  The gas A flowing into the seal box 8 is exhausted from the exhaust port 10. At this time, since the exhausted gas A contains a harmful component in which a part of the paint bath 5 (paint N) is vaporized, this harmful component is removed by the post-processing equipment 44.

  Therefore, according to the liquid wiping apparatus according to the present invention, the wiper 21 and the side seal block 22 are provided on the exit side of the opening 9 of the seal box 8, and the slit nozzles 25a and 25b are provided in the transport direction to provide a static pressure holding unit. By forming P, not only wiping can be performed, but also the sealing performance can be improved. Therefore, it is possible to prevent air from entering between the wipers 21 and discharge of the non-oxidizing gas G from the opening 9. Can do. Further, since the side seal blocks 22 are provided on both sides of the steel plate S, the sealing performance can be improved at both ends of the steel plate S.

  In the present embodiment, the liquid wiping device 12 is applied to the coating equipment 41. However, for example, the liquid wiping device 12 may be applied to a chemical conversion treatment device that performs chemical conversion treatment on a steel sheet that is continuously conveyed using a harmful chemical conversion treatment liquid. Absent.

  An annealing furnace equipped with a liquid wiping apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in 1st Example, and description is abbreviate | omitted.

  As shown in FIG. 6, the steel sheet S is continuously supplied to the annealing furnace 51. The annealing furnace 51 is provided with a low dew point atmosphere seal box 52 that anneals the steel sheet S in a low dew point atmosphere. The low dew point atmosphere seal box 52 has a low dew point gas that is non-oxidizing, reducing, or weakly oxidizing. An inert atmosphere is maintained by g. In the low dew point atmosphere seal box 52, the inlet side sealing means 66 and the heating means 67 are provided on the inlet side of the steel sheet S, while the outlet side sealing means 68 is provided on the outlet side of the steel sheet S and the outlet side seal. A box 69 is formed. The outlet seal box 69 has an exhaust port 70 and a discharge port 71, and a liquid wiping device 12 and a drying means 72 are provided on the inlet side of the discharge port 71.

  In addition, a discharge port 53 and a carry-in port 54 are opened on the lower surface of the low dew point atmosphere seal box 52, and a liquid wiping device 12 is provided below the discharge port 53 and the carry-in port 54 with a sealing material 11 interposed therebetween. ing. Low dew point gas g is ejected from the slit nozzles 25a and 25b of the liquid wiping device 12.

  Further, a discharge side casing 55 and a carry-in side casing 56 are provided below the liquid wiping device 12 via the sealing material 11. The discharge side casing 55 is formed with an opening 57, a discharge path 58 and an exhaust port 59, while the carry-in side casing 56 is formed with a carry-in path 60, an opening 61 and an exhaust port 62. The lower ends of the discharge path 58 and the carry-in path 60 are immersed in a cooling water bath 63 described later, and the exhaust ports 59 and 62 communicate with the atmosphere. A cooling water bath 63 in which cooling water W is stored is provided below the discharge path 58 and the carry-in path 60, and the discharge-side sink roll 64 and the carry-in sink roll 65 are rotatable in the cooling water bath 63. Is provided.

  Therefore, by making the above-described configuration, the steel sheet S conveyed into the low dew point atmosphere seal box 52 is annealed by the heating means 67 in an inert atmosphere, and then rotated from the discharge port 53 by the rotation of the discharge side sink roll 64. Discharged. Then, while being sealed in the liquid wiping device 12 on the discharge side, it passes through the discharge side casing 55 and is conveyed into the cooling water bath 63. Next, the cooled steel plate S is pulled up by the rotation of the carry-in sink roll 65 and conveyed into the carry-in casing 56. At this time, a large amount of cooling water W is attached to the surface of the steel sheet S. Then, the steel sheet S to which the cooling water W adheres is wiped and sealed in the liquid wiping device 12 on the carry-in side, transported again into the low dew point atmosphere seal box 52, dried by the drying means 72, and discharged to the next process. Is done.

  Here, when the steel sheet S is rapidly cooled in the cooling water bath 63, water vapor w is generated in the vicinity of the discharge-side sink roll 64. The water vapor w enters the discharge side casing 55 from the discharge path 58 and tries to enter the low dew point atmosphere seal box 52 from the discharge port 53 through the opening 57. However, since the liquid wiping device 12 is disposed between the low dew point atmosphere seal box 52 and the discharge-side casing 55, entry thereof can be prevented. That is, the static pressure holding part P is formed by the low dew point gas g injected from the slit nozzles 25a and 25b, and the sealing performance is improved, so that the water vapor w enters from the discharge port 53 and is discharged from the low dew point gas g. And prevent.

  On the other hand, water vapor w is also generated in the vicinity of the carry-in sink roll 65. As the steel sheet S is carried in, the water vapor w in the carry-in casing 56 tends to enter the low dew point atmosphere seal box 52 from the carry-in entrance 54 through the opening 61. However, since the liquid wiping device 12 is disposed between the low dew point atmosphere seal box 52 and the carry-in casing 56, entry thereof can be prevented. That is, by wiping with the low dew point gas g ejected from the slit nozzles 25a and 25b and forming the static pressure holding portion P to improve the sealing performance, the intrusion of the water vapor w from the carry-in port 54 and the low dew point gas The discharge of g is prevented.

  Therefore, according to the liquid wiping apparatus of the present invention, the wiper 21 and the side seal block 22 are provided on the exit side of the discharge port 53 and the entrance side of the carry-in port 54 of the low dew point atmosphere seal box 52, and the slit nozzle is provided in the transport direction. The static pressure holding part P can be formed by providing 25a and 25b. Thereby, since the sealing performance can be improved on the discharge port 53 side, it is possible to prevent the entry of the water vapor w and the discharge of the low dew point gas g. On the other hand, on the carry-in port 43 side, not only wiping but also sealing performance can be improved, so that the entry of water vapor w can be prevented and the low dew point gas g can be prevented from being discharged. Further, since the side seal blocks 22 are provided on both sides of the steel plate S, the sealing performance can be improved at both ends of the steel plate S. In the liquid wiping device 12 on the downstream side in the transport direction of the drying means 72, the same function and effect can be obtained.

  The present invention can be applied to a liquid wiping device that combines wiping and sealing.

It is a schematic sectional drawing of the molten metal plating equipment provided with the liquid wiping apparatus which concerns on 1st Example of this invention. It is a schematic sectional drawing of a liquid wiping apparatus. FIG. 3 is a plan sectional view of FIG. 2. It is a schematic sectional drawing of the molten metal plating equipment provided with the liquid wiping apparatus which concerns on 2nd Example of this invention. It is a schematic sectional drawing of the coating equipment provided with the liquid wiping apparatus which concerns on 3rd Example of this invention. It is a schematic sectional drawing of the annealing furnace provided with the liquid wiping apparatus which concerns on 4th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,31,51 Annealing furnace 2 Molten metal plating equipment 5 Molten metal plating bath 8 Seal box 9 Opening part 12 Liquid wiping apparatus 16 Vaporized metal component removal means 18 Wiping gas supply apparatus 21 Wiper 22 Side seal block 23 Casing 24 Chamber 25a Above Slit nozzle 25b Lower slit nozzle 25c Intermediate slit nozzle 41 Coating equipment 42 Paint bath 52 Low dew point atmosphere seal box 53 Discharge port 54 Carry in port 63 Cooling water bath

Claims (5)

The lower end is immersed in a liquid bath to form a seal box filled with a gas different from the outside atmosphere so as to surround the strip that has been pulled up after being immersed in the liquid bath,
A pair of nozzles arranged oppositely so as to approach and separate in accordance with the thickness of the strip plate across the strip plate discharged from the seal box is provided in multiple stages in the transport direction on the exit side of the opening of the seal box ,
A liquid wiping apparatus, wherein the liquid is wiped by ejecting a gas different from an external atmosphere from the nozzle toward the strip. The liquid wiping device according to claim 1.
The gas injected from the nozzle flowing into the seal box is cooled to remove the vaporized component of the liquid and then used as the atmospheric gas for the pretreatment process, while the heat deprived during the cooling of the gas is newly supplied. A liquid wiping apparatus, wherein the liquid wiping apparatus transmits the gas to the gas and ejects the gas from the nozzle. The liquid wiping device according to claim 1.
The gas injected from the nozzle flowing into the seal box is cooled to remove the vaporized component of the liquid, while the heat taken away during the cooling of the gas is transferred to the newly supplied gas, and the heat transferred A liquid wiping apparatus, wherein gas is ejected from the nozzle together with the gas from which vaporized components have been removed. A seal box filled inside with a gas different from the outside atmosphere is placed above the liquid bath,
A pair of nozzles arranged opposite to each other so as to approach and separate in accordance with the thickness of the strip plate across the strip plate that is pulled up after being immersed in the liquid bath is multi-staged in the transport direction on the entrance side of the carry-in entrance of the seal box Provided,
A liquid wiping apparatus, wherein the liquid is wiped by ejecting a gas different from an external atmosphere from the nozzle toward the strip. The liquid wiping apparatus according to any one of claims 1 to 4,
A liquid wiping apparatus, wherein a side seal block is provided between the pair of nozzles so as to approach and separate according to the width of the strip.

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