0001]The present invention, heating zones strip of steel is sequentially transmitted, soaking zone, and a cooling facility to be applied to the cooling zone in a continuous annealing furnace having a cooling zone, in particular, steel sheet cooling gas hydrogen is added injected into, it relates to a cooling facility for cooling the steel plate.
BACKGROUND
[0002]Steel sheet after cold rolling, since the material by plastic deformation is cured, it is necessary to annealing in order to soften the cured material. Usually, the annealing process, heating zone, soaking zone, and is carried out in a continuous annealing furnace having a cooling zone (e.g., see Patent Documents 1-8). In the continuous annealing furnace, the strip of steel sheet, heating zone, soaking zone, and is sent in sequence to the cooling zone.
[0003]
　In the annealing process by the continuous annealing furnace, cooling rate after soaking the steel sheet, that is, as the cooling rate from the cooling starting of the steel sheet in the cooling zone is high, high strength is obtained with a small alloy volume.
[0004]
　Therefore, in the annealing process by the continuous annealing furnace, in order to increase the cooling rate from the cooling starting of the steel sheet in the cooling zone, and injecting cooling gas hydrogen is added to the steel sheet. According to this method, hydrogen is the thermal conductivity compared to nitrogen is approximately 7-fold, is to be able to increase the cooling rate of the steel sheet.
CITATION
Patent Document
[0005]
Patent Document 1: JP-B 55-1969 Patent Publication
Patent Document 2: JP-A 9-235626 Patent Publication
Patent Document 3: JP-A 11-80843 discloses
Patent Document 4: JP 2002-3954 JP
Patent Document 5: JP 2005-60738 JP
Patent Document 6: JP-A 11-236625 JP
Patent Document 7: JP-A 11-335744 JP
Patent Document 8: JP 2003-277835 JP
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　However, in general because hydrogen is expensive, in order to reduce the manufacturing cost of the steel sheet, it is desirable to be able to reduce the amount of hydrogen.
[0007]
　Accordingly, the present invention is to increase the cooling rate from the cooling starting of the steel sheet in the cooling zone, and to provide a cooling system in a continuous annealing furnace that can reduce the amount of hydrogen.
Means for Solving the Problems
[0008]
　In order to solve the above problem, cooling equipment in a continuous annealing furnace according to one embodiment of the present invention, the heating zone strip of steel is sequentially transmitted, soaking zone, and, in the cooling zone in a continuous annealing furnace having a cooling zone together they are arranged, aligned in the feed direction of the steel sheet, and a plurality of ejection portions for ejecting respective cooling gas hydrogen is added from a plurality of injection nozzles to the steel plate, the plurality of ejection portions of the cooling zone in the arrangement space, so that towards the upstream side of the region is formed is the hydrogen concentration is high hydrogen concentration distribution than the area of ​​the downstream side, the hydrogen concentration of the cooling gas ejected from each of the plurality of ejection portions and a hydrogen concentration adjustor for adjusting, each of said plurality of injection nozzles in the plurality of ejection portions, with lined the feed direction of the steel sheet as an array direction, which respectively extend toward the steel plate, each Serial injection nozzles located on both sides of at least the arrangement direction of the plurality of injection nozzles is inclined toward the center side of the array direction toward the distal end side.
Effect of the invention
[0009]
　According to the cooling equipment in continuous annealing furnace according to one embodiment of the present invention, while increasing the cooling rate from the cooling starting of the steel sheet in the cooling zone, it is possible to reduce the amount of hydrogen.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010]
FIG. 1 is a front view showing a continuous annealing furnace.
[2] is a front view of the cooling zone cooling system is applied according to a first embodiment of the present invention.
FIG. 3 is a front view including a partial section of the periphery of the inlet side sealing apparatus of FIG.
It is a front view including a partial section of the periphery of the plurality of injection devices [4] FIG.
It is a side view of the injector of FIG. 5 FIG.
It is a front view including a partial section of the peripheral portion of FIG. 6 upstream of the injector of FIG.
7 is a front view including a partial section of the peripheral portion of the downstream side of the injector of FIG.
[Figure 8] is a front view including a partial section of the periphery of the intermediate seal device of FIG. 4 is a view showing a state in which the upstream support roll and the downstream support roll is in contact with the steel plate.
[Figure 9] is a front view including a partial section of the periphery of the intermediate seal device of FIG. 4 is a view showing a state in which the upstream support roll and the downstream support roller is away from the steel plate.
[10] a plan view in partial cross-section of the peripheral portion of the upstream-side seal portion of the intermediate seal device of FIG. 4 is a view showing a state in which the upstream support roll away from the steel plate.
11 is a side view showing a first modification of the injector of FIG.
Is a side view showing a second modification of the injector of FIG. 12 FIG.
Is a side view showing a third modification of the injector of FIG. 13 FIG.
It is a front view showing a modified example of FIG. 14 in FIG. 2 the cooling system.
It is a front view including a partial section of the periphery of the plurality of injection parts in FIG. 15 cooling zone cooling system is applied according to a second embodiment of the present invention.
FIG. 16 is a front view showing a first modification of the upstream side of the injection portion of FIG.
17 is a front view showing a second modification of the upstream side of the injection portion of FIG.
18 is a front view showing a third modification of the upstream side of the injection portion of FIG.
19 is a front view showing a fourth modification of the upstream side of the injection portion of FIG.
[20] cooling equipment according to the comparative example is a front view of the applied cooling zone.
DESCRIPTION OF THE INVENTION
[0011]
　[First Embodiment]
　First, explaining the first embodiment of the present invention.
[0012]
　Continuous annealing furnace 10 shown in Figure 1 is for annealing a strip of steel 12 after cold rolling, having a cylindrical furnace body 14. Furnace body 14, a specific processing step, heating zone 16, a soaking zone 18, and has a cooling zone 20, the steel plate 12, heating zone 16, a soaking zone 18, and are sent in the order of the cooling zone 20. In the heating zone 16, the steel plate 12 is heated, the soaking zone 18, the steel plate 12 is kept soaking state, the cooling zone 20, the steel plate 12 is cooled.
[0013]
　As shown in FIG. 2, the cooling system 50 according to the first embodiment of the present invention is applied to a cooling zone 20 in the continuous annealing furnace 10 described above. In this cooling zone 20, a furnace body 14, inlet-side path space 22, up path space 24, intermediate path space 26, down path space 28, and has an outlet-side path space 30. Inlet-side path space 22, the outlet-side path space 30 and, the intermediate path space 26 extends in the horizontal direction, up path space 24 and down path space 28 extends in the vertical direction (vertical direction).
[0014]
　The upstream end of the up-path space 24 is connected to the downstream end of the inlet-side path space 22, intermediate path space 26 couples the upstream end of the downstream end and down path space 28 of the up path space 24 . The downstream end of the down path space 28 is connected to the upstream end of the outlet-side path space 30.
[0015]
　Steel 12 is fed toward the exit side path space 30 from inlet-side path space 22. The up-path space 24, the steel plate 12 is fed toward the vertically upper side, the down path space 28, the steel plate 12 is fed toward the vertically lower side. Further, inlet-side path space 22, intermediate path space 26, and, in the exit side path space 30, the steel plate 12 is fed along the horizontal direction.
[0016]
　The downstream end of the inlet-side path space 22, the upstream end of the intermediate path space 26, the downstream end of the intermediate path space 26, the upstream end of the outlet-side path space 30, and the downstream end of the outlet-side path space 30, of the steel plate 12 deflecting roller 32 to change the orientation, respectively.
[0017]
　The cooling zone 20, in addition to the cooling system 50 according to the first embodiment of the present invention to be described later, entry-side sealing apparatus 34, inlet side exhaust system 36, the exit side sealing device 38, and, the outlet side exhaust system 40 is provided.
[0018]
　Entry-side sealing apparatus 34 is provided in inlet-side path space 22. As shown in FIG. 3, the inlet side sealing apparatus 34 includes a plurality of seal set 44. A plurality of seal set 44 are aligned in the longitudinal direction of the inlet-side path space 22.
[0019]
　Each seal set 44 has a support roller 46 and the heat insulating member 48 facing the vertical direction. Support roller 46 and the heat insulating material 48 is disposed so as to be positioned in the thickness direction on both sides of the steel plate 12 in the inlet-side path space 22.
[0020]
　In each of the seal set 44, support roller 46, a steel plate 12 supporting the tip of the heat insulating material 48, or close to the steel plate 12, or in contact with the steel plate 12. Insulation material 48, for example constituted by a member having flexibility such as a fiber blanket. In the seal set 44 adjacent of the plurality of sealing sets 44, the arrangement of the support roller 46 and the heat insulating material 48 are different from each other.
[0021]
　Entry-side exhaust system 36 is provided in a position corresponding to the entry-side sealing apparatus 34. The entry side exhaust system 36 operates to discharge the cooling gas inlet-side path space 22 to the outside. Inlet of the inlet side exhaust system 36, as an example, is open between the plurality of seal set 44 provided in the entry-side sealing apparatus 34.
[0022]
　Exit side sealing device 38 and the exit-side exhaust system 40 shown in FIG. 2 has the same configuration as the input side sealing device 34 and the inlet side exhaust system 36 described above. Exit side sealing device 38 is provided on the exit side path space 30, having a plurality of sealing set 44. Outlet side exhaust device 40 is provided at a position corresponding to the exit side sealing device 38 operates to discharge the cooling gas exit side path space 30 to the outside.
[0023]
　Cooling equipment 50 according to the first embodiment of the present invention is intended for cooling the steel plate 12. As shown in FIG. 4, the cooling system 50 comprises a plurality of injectors 52A ~ 52D, the plurality of intermediate seal device 56. The plurality of injectors 52A ~ 52D and a plurality of intermediate seal device 56, as an example, are arranged on the down path space 28 of the cooling zone 20.
[0024]
　A plurality of injectors 52A ~ 52D are used to inject a cooling gas to the steel plate 12 correspond to the "plurality of injection portion" in the present invention. The plurality of injectors 52A ~ 52D are lower in the vertical direction of the upper-down path space 28, i.e., are arranged in this order from the upstream side to the downstream side of the feeding direction of the steel plate 12 in the down-path space 28.
[0025]
　Among the plurality of injectors 52A ~ 52D, a plurality of injectors 52A, 52B is disposed above, i.e. on the upstream side of the central portion in the vertical direction in the down path space 28. On the other hand, a plurality of injectors 52C of the plurality of injectors 52A ~ 52D, 52D are arranged lower, that is, downstream of the central portion in the vertical direction in the down path space 28.
[0026]
　Further, a plurality of injectors 52A ~ 52D are respectively disposed on both sides of the steel plate 12, one of a plurality of injectors 52A ~ 52D is opposed to the one plate surface of the steel plate 12, the other a plurality of injectors 52A ~ 52D is opposed to the other plate surface of the steel plate 12.
[0027]
　A plurality of injectors 52A ~ 52D is the same configuration as each other. Hereinafter, when describing collectively each of the plurality of injectors 52A ~ 52D are simply referred to as the injector 52 of each of the plurality of injectors 52A ~ 52D. As shown in FIG. 5, each injector 52 is a so-called high-speed gas jet configuration, having a plurality of injection nozzles 60 formed in a linear cylindrical shape. Incidentally, the injection nozzle 12 may if jetting a high-speed gas, a slit-shaped well may be in any shape well tubular.
[0028]
　A plurality of injection nozzles 60 extends toward the steel plate 12, the distal end of the plurality of injection nozzles 60, injection port 62 for injecting cooling gas is formed. Tips of the plurality of injection nozzles 60 is located close to the steel plate 12 to the extent that does not interfere with the steel plate 12 is fed in the vertical direction lower side.
[0029]
　Further, a plurality of injection nozzles 60 are aligned with the feed direction of the steel plate 12 as an array direction. In a first embodiment, the arrangement direction of the plurality of injection nozzles 60 coincides with the vertical direction of the injector 52. The plurality of injection nozzles 60 are arranged in the width direction of the injector 52 which coincides with the width direction of the steel plate 12.
[0030]
　Injection nozzles 60 located on either side of the vertical direction of the injection device 52 of the plurality of injection nozzles 60 is inclined to face the center of the vertical direction of the injector 52 toward the tip side. The inclination angle θ with respect to the vertical direction of the injection device 52 in the injection nozzle 60 is set to, for example, about 20 ° ~ about 45 °. When the inclination angle θ is smaller than 20 °, difficult to obtain the effect of the cooling gas spreads vertically below, the inclination angle θ is greater than 45 °, the distance from the tip of the jet nozzle 60 to the injection direction of the steel plate 12 too large, the cooling effect of the cooling gas is to reduce jetted from the jetting nozzle 60.
[0031]
　While the remaining plurality of injection nozzles 60 except the injection nozzle 60 located on both sides of the above among a plurality of injection nozzles 60, the longitudinal direction of the injector 52, i.e., along the normal direction of the plate surface of the steel plate 12 It extends.
[0032]
　As shown in FIG. 6, between the pair of injectors 52A facing each other, a suction port 64 for sucking the cooling gas injected from a pair of injector 52A is provided. The inlet port 64 is arranged between the injection nozzle 60 located on either side vertical injector 52A. And the inlet port 64 and a pair of injectors 52A, are connected via a circulation mechanism 66.
[0033]
　Circulation mechanism 66 has a forward pipe 68, return pipe 70, heat exchanger 72, the hydrogen supply source 74, and the blower 76. The heat exchanger 72 is connected to the inlet port 64 through the return pipe 70, a pair of injector 52A is connected to the heat exchanger 72 via the forward path tube 68. The heat exchanger 72 cools the cooling gas by air or water cooling.
[0034]
　Hydrogen supply source 74 is connected to the forward pipe 68, operative to supply hydrogen (hydrogen gas) in the forward path tube 68. By hydrogen in the outward pipe 68 supplied from the hydrogen supply source 74, hydrogen is added to the cooling gas injected from a pair of injector 52A. Blower 76 is provided in the forward tube 68, along with the jetting the cooling gas from a pair of injector 52A, operative to circulate a cooling gas between the inlet port 64 and a pair of injector 52A.
[0035]
　As shown in FIG. 6, a pair of injection device similar inlet port 64 and the circulating mechanism and the suction port 64 and the circulation mechanism 66 provided for 52A 66 described above, also provided for the pair of injectors 52B It is. The pair suction port 64 provided for the injection apparatus 52A and of the circulation mechanism 66 similar inlet 64 and the circulation mechanism 66 mentioned above, a pair of injection device 52C shown in FIG. 7, with respect to 52D It is provided, respectively.
[0036]
　Hydrogen supply source 74 at a plurality of circulation mechanisms 66 provided for a plurality of injectors 52A ~ 52D corresponds to "hydrogen concentration regulating portion" in the present invention, be supplied to each of the plurality of injectors 52A ~ 52D It has become adjustable, respectively by a flow rate control valve or the like the flow rate of hydrogen.
[0037]
　Note that the cooling gas injected from a plurality of injectors 52A ~ 52D described above, includes in addition to the nitrogen of added hydrogen. As the hydrogen is added to the cooled gas, for example, it can be used those obtained by decomposing ammonia.
[0038]
　Cooling gas injected from a plurality of injectors 52A-52D are preferably hydrogen is set to include about 10% to about 70% by volume. To use a cooling gas of hydrogen contained about 10% to about 70% by volume is to achieve both the cooling effect and economy to the steel sheet 12.
[0039]
　That is, when the hydrogen in the cooling gas is more than about 70% by volume, the thermal transfer coefficient becomes impossible to obtain a high cooling effect is saturated and the cost becomes high. On the other hand, if the hydrogen in the cooling gas is less than about 10% by volume, it can not be obtained the desired cooling effect. Therefore, by using a cooling gas of hydrogen contained about 10% to about 70% by volume, while ensuring a sufficient cooling effect to the steel sheet 12, so that also economy can be ensured.
[0040]
　As shown in FIG. 4, a plurality of intermediate seal unit 56 is arranged in the feed direction of the steel plate 12. A plurality of intermediate seal device 56, between the pair of injectors 52A and the pair of injectors 52B, between the pair of injectors 52B and the pair of injectors 52C, and a pair of injector 52C and a pair of injectors It is arranged between the 52D.
[0041]
　A plurality of intermediate seal device 56 is the same configuration as each other. 8, as shown in FIG. 9, the intermediate seal device 56 has an upstream-side seal portion 88 and the downstream-side seal portion 90. Upstream seal portion 88, the upstream support roll 92, upstream the first seal portion 94, the upstream side second seal portion 96 and, is constituted by the upstream roller seal portion 98. On the other hand, the downstream-side seal portion 90, downstream support roll 102, the downstream side first seal portion 104, the downstream side second seal portion 106 and is composed of a downstream roller seal portion 108.
[0042]
　Upstream support roll 92 and the downstream support roll 102 is disposed in the width direction of the steel plate 12 as the axial direction. The upstream support roll 92 and the downstream support roll 102 is rotatably supported respectively by a rotary shaft 100, 110 extending in the width direction of the steel plate 12. Upstream support roll 92 is arranged in the thickness direction one side of the steel plate 12, downstream support roll 102 is disposed in the thickness direction other side of the steel plate 12. Also, downstream support roll 102, the vertical direction lower side with respect to the upstream support roll 92, i.e., disposed on the downstream side of the feeding direction of the steel plate 12 with respect to the upstream support roll 92.
[0043]
　As shown in FIG. 10, the furnace body 14, a pair of guide holes 112 at both ends of the rotary shaft 100 penetrates is formed. A pair of guide holes 112 are formed by elongated holes which extend in a direction perpendicular to the axial direction of the rotating shaft 100 in a plan view. By rotating shaft 100 is guided by the pair of guide holes 112, the upstream support roll 92 is capable of separable relative to the steel plate 12.
[0044]
　The furnace body 14, Figure a pair of guide holes 112 similar guide holes shown in FIG. 10 8 are formed also for downstream support roll 102 shown in FIG. 9, the downstream-side support rolls 102 , similarly to the upstream support roll 92, and can separable relative to the steel plate 12.
[0045]
　Figure 8 is upstream support roll 92 and the downstream support roll 102 are in contact state is shown in the steel plate 12, in FIG. 9, the upstream support roll 92 and the downstream support roll 102 away from the steel plate 12 state is shown was. Further, in FIG. 10 shows a state in which the upstream support roll 92 is separated from the steel plate 12 is shown.
[0046]
　As shown in FIG. 10, the intermediate sealing device 56 has a drive mechanism 114. Drive mechanism 114 shown in FIG. 10 is for contacting and separating the upstream support roll 92 with respect to the steel plate 12 is provided on the outside of the furnace body 14. The drive mechanism 114 includes a motor 116, drive shaft 118, a pair of driven shafts 120, a pair of drive gears 122, and a pair of driven gear 124, a pair of sliders 126, and a pair of bellows 128.
[0047]
　Drive shaft 118 is connected to the output shaft of the motor 116 is disposed parallel to the rotary shaft 100. At both ends of the drive shaft 118, drive gear 122 is fixed, respectively. A pair of driven shaft 120 extends in a direction perpendicular to the rotation axis 100 in a plan view. At one end of the pair of driven shafts 120, and the driven gear 124 are fixed respectively, each driven gear 124 is drive gear 122 meshes. Driven shaft 120 and the slider 126 constitute a ball screw mechanism, the pair of sliders 126, both end portions of the rotating shaft 100 is fixed.
[0048]
　In the driving mechanism 114, the slider 126 with the rotation of the forward and backward direction of the output shaft of the motor 116 reciprocates, the upstream support roll 92 is separated into contact against the steel plate 12. A pair of bellows 128 is formed of, for example, high heat resistance such as a silicone rubber material. The peripheral edge portion and the slider 126 of the guide hole 112 are connected by a bellows 128, guide hole 112 is sealed by the bellows 128.
[0049]
　The intermediate seal device 56, FIG similar driving mechanism 154 and the driving mechanism 114 shown in FIG. 10 8, is provided also to the downstream support roll 102 shown in FIG. 9, the downstream by the drive mechanism 154 side support roll 102 is separated into contact against the steel plate 12. Upstream support roll 92 and the downstream support roll 102, respectively supporting the steel plate 12 from a thickness direction one side and the other side of the steel plate 12 in a state in contact with the steel plate 12.
[0050]
　8, as shown in FIG. 9, the upstream first sealing section 94 includes a steel plate 12 with respect to the upstream support roll 92 is arranged on the opposite side, towards the upstream support roll 92 from the inner wall of the furnace body 14 Te extends. On the other hand, the upstream side second seal portion 96 is disposed on the opposite side of the upstream support roll 92 to the steel sheet 12, and extends toward the steel plate 12 from the inner wall of the furnace body 14. End of the steel plate 12 side in the upstream side second seal portion 96 is close to the steel plate 12. Between the upstream first sealing section 94 and the upstream second seal portion 96, a gap for passing the steel plate 12, to move toward or away from the upstream support roll 92 with respect to the steel plate 12 gap of is ensured.
[0051]
　As shown in FIG. 10, the upstream roller seal portion 98 is fixed to the rotation shaft 100, it moves together with the rotating shaft 100 and the upstream support roll 92. This is the upstream roller seal portion 98, the concave portion 130 for accommodating the upstream support roll 92 is formed. As shown in FIG. 8, in the state in which the upstream support roll 92 is in contact with the steel plate 12, the upstream support roll 92 and the upstream roller seal portion 98, between the upstream first sealing section 94 and the steel plate 12 the gap is closed. End of the upstream first sealing section 94 side of the upstream roller seal portion 98 is overlapped with the end portion of the upstream roller seal portion 98 side in the upstream side first seal portion 94.
[0052]
　8, the downstream support roll 102 shown in FIG. 9, the downstream side first seal portion 104, the downstream side second seal portion 106 and, downstream roller seal 108 upstream support roll 92 described above, the upstream side the first seal portion 94, the upstream side second seal portion 96, and, is placed against the upstream roller seal portion 98 are reversed.
[0053]
　Downstream first seal portion 104 is disposed on the opposite side of the steel plate 12 against the downstream support roll 102, and extends toward the downstream side supporting roll 102 from the inner wall of the furnace body 14. On the other hand, the downstream side second seal portion 106 is disposed on the side opposite to the downstream support roll 102 to the steel sheet 12, and extends toward the steel plate 12 from the inner wall of the furnace body 14. End of the steel plate 12 side in the downstream second seal portion 106 is close to the steel plate 12. Between the downstream side first seal portion 104 and a downstream second seal portion 106, a gap for passing the steel plate 12, to move toward or away from the downstream support roll 102 with respect to the steel plate 12 gap of is ensured.
[0054]
　Similarly to the upstream roller seal portion 98, the downstream roller seal 108 is fixed to the rotary shaft 110, it moves together with the downstream support roll 102. As shown in FIG. 9, in the state where the downstream support roll 102 is in contact with the steel plate 12, the downstream support roll 102 and the downstream roller seal portion 108, between the downstream first seal portion 104 and the steel plate 12 the gap is closed. End of the downstream side first seal portion 104 side of the downstream roller seal part 108 is overlapped with an end portion of the downstream roller seal portion 108 side of the downstream side first seal portion 104.
[0055]
　Incidentally, as shown in FIG. 2, the down path space 28, a plurality of support rolls 131 and 132 for supporting the steel plate 12 from the plate thickness direction is provided. Support rolls 131 is placed on top of the down path space 28, the support roller 132 is disposed below the down path space 28. Upstream support roll 92 provided in each intermediate seal device 56 described above, the downstream support roll 102, and a plurality of support rolls 131 and 132, function of suppressing fluttering of the steel plate 12 by contact with the steel plate 12 having.
[0056]
　Subsequently, the cooling method is described in a continuous annealing furnace using a cooling equipment 50 according to the first embodiment of the present invention. Cooling method in the continuous annealing furnace, as will be described hereinbelow, it comprises a sealing step, and a cooling gas injection step.
[0057]
　[Seal Step]
　In the sealing step, a plurality of intermediate seal device 56 is operated to seal. That is, the motor 116 is operated as shown in FIG. 10, the driving force of the motor 116, the drive shaft 118, a pair of drive gears 122, a pair of driven gears 124 and a pair of sliders through a pair of driven shafts 120 126 is transmitted to. The upstream support roll 92 with a pair of sliders 126 are moved closer to the steel plate 12, as shown in FIG. 8, the upstream support roll 92 is in a state of contact with the steel plate 12. In a state in which the upstream support roll 92 is in contact with the steel plate 12, the upstream support roll 92 and the upstream roller seal portion 98, the gap between the upstream first sealing section 94 and the steel plate 12 is closed.
[0058]
　Similarly, drive mechanism 154 provided for the downstream support roll 102 is operated as shown in FIG. 9, the downstream support roll 102 is in a state of contact with the steel plate 12. In a state where the downstream support roll 102 is in contact with the steel plate 12, the downstream support roll 102 and the downstream roller seal 108, the gap between the downstream first seal portion 104 and the steel plate 12 is closed.
[0059]
　Then, a plurality of intermediate seal 56, between the pair of injectors 52A and a pair of injection device 52B shown in FIG. 2, between the pair of injectors 52B and the pair of injectors 52C, and a pair of injection between the device 52C and the pair of injector 52D is sealed, respectively. Upstream support roll 92 and the downstream support roll 102, while rotating by contact with the steel plate 12 passing through the down path space 28, which supports the steel plate 12 from the thickness direction on both sides.
[0060]
　Cooling gas injection step]
　Subsequently, the cooling gas jetting step, FIG. 6, each blower 76 is operated as shown in FIG. 7, the cooling gas is injected from a plurality of injectors 52A ~ 52D on the steel plate 12. At this time, in order to enhance the cooling of the steel sheet 12, the plurality of injectors 52A ~ 52D cooling gas is injected at full flow rate (jet).
[0061]
　Further, when a plurality of injectors 52A ~ 52D cooling gas is injected, FIG. 6, and supplies hydrogen to the outward pipe 68 operates and the hydrogen supply source 74 shown in FIG. Therefore, the cooling gas injected from a plurality of injectors 52A ~ 52D are both a cooling gas of hydrogen was added.
[0062]
　The hydrogen supply source 74 of the circulation mechanism 66 on the upstream side shown in FIG. 6, a large amount of hydrogen than the hydrogen supply source 74 of the circulation mechanism 66 on the downstream side as shown in FIG. 7 in the outward pipe 68 supplies. Therefore, a plurality of injectors 52A upstream, from 52B, a plurality of injectors 52C downstream, cooling gas high hydrogen concentration than the cooling gas 52D is injected is injected. Then, the down path space 28, a plurality of injectors 52A, 52B is a plurality of injectors 52C toward the area of ​​the arranged upstream hydrogen concentration higher hydrogen concentration distribution than the region of the 52D is arranged downstream There is formed.
[0063]
　Thus, for example, as compared with the case where the hydrogen concentration distribution becomes constant cooling gas of the same hydrogen concentration from a plurality of injectors 52A ~ 52D is injected, the cooling rate after soaking of the steel plate 12, i.e., the cooling zone cooling rate from the cooling starting of the steel plate 12 is increased at 20, the steel plate 12 is rapidly cooled from a higher temperature state. In this embodiment, as the desired cooling rate can be obtained, a plurality of injectors 52A on the upstream side, the cooling gas injected from 52B, at least one of the hydrogen concentration and the flow rate is adjusted.
[0064]
　Note that the injection device 52A and the injection device 52B, the hydrogen concentration of the cooling gas to be injected may be the same, also, who injectors 52A may be a high hydrogen concentration of the cooling gas to be injected than injection device 52B. Similarly, the injection device 52C and the injection device 52D, the hydrogen concentration of the cooling gas to be injected may be the same, also, who injector 52C may be higher hydrogen concentration of the cooling gas to be injected than injection device 52D .
[0065]
　The hydrogen concentration in the cooling gas to be injected than the injection device 52B toward the injector 52A is high and, if the hydrogen concentration in the cooling gas to be injected than the injection device 52D towards the injector 52C is high, the injection device 52D There disposed regions, regions injector 52C is disposed, the region injector 52B is disposed, is forward to the hydrogen concentration is high hydrogen concentration distribution in the region where injection device 52A is disposed is formed. In the present embodiment, as an example, the hydrogen concentration in the cooling gas the injected from a plurality of injectors 52A ~ 52D so that, being adjusted such that sequentially increases from the downstream side of the injector 52D toward the upstream side of the injection device 52A that.
[0066]
　Further, as shown in FIG. 6, in each injector 52, the injection nozzle 60 located on either side vertical injector 52 among the plurality of injection nozzles 60, vertical injector 52 toward the tip side They are inclined toward the central side. Therefore, from the opposite sides of the injection nozzle 60, the cooling gas is injected toward the center side in the vertical direction of the injector 52. Accordingly, cooling gas impinging on to the steel plate 12 injected from the both sides of the injection nozzle 60 to spread the top and bottom of the injector 52 is suppressed.
[0067]
　On the other hand, in each of the injectors 52, the remaining of the plurality of injection nozzles 60 except the injection nozzle 60 located on both sides of the above among a plurality of injection nozzles 60 extend along the normal direction of the plate surface of the steel plate 12 . Therefore, from this remaining injection nozzle 60, the cooling gas is injected along the normal direction of the plate surface of the steel plate 12. Thus, from the rest of the injection nozzle 60, the cooling gas injected at the shortest distance towards the steel plate 12, and the cooling gas so hits perpendicular to the steel plate 12, the steel plate 12 is efficiently cooled.
[0068]
　The cooling gas injected from each injector 52 as described above is sucked from the suction port 64, is cooled in heat exchanger 72. The cooling gas cooled in the heat exchanger 72, hydrogen supplied from the hydrogen supply source 74 is added. The cooling gas is supplied to the injector 52 through the blower 76, it is injected from the injector 52. As the cooling gas injected from the injection device 52 is maintained at a desired hydrogen concentration, flow rate of hydrogen supplied from the hydrogen supply source 74 is adjusted by the flow rate control valve or the like.
[0069]
　The cooling gas injected from the downstream side of the injector 52D, the other plurality of injectors 52A, 52B, is set to a lower hydrogen concentration than the cooling gas injected from 52C. Therefore, in the injection device 52D on the downstream side is arranged regions, a plurality of other injectors 52A, 52B, 52C is the steel plate 12 as compared to the arrangement area is slowly cooled.
[0070]
　Here, for example, are described in "Japanese Patent Application No. 2004-375756 (Japanese Unexamined Patent Application Publication No. 2006-183075)", and, "Steel Times International-January / February 2011 Flash Cooling technology for the production of high strength galvanised steels" as quenching end point temperature of the steel plate 12 is important in order to ensure the strength of the steel plate 12.
[0071]
　Therefore, in this embodiment, so that the steel plate 12 has a desired quenching end point temperature, the cooling gas injected from the downstream side of the injector 52D, at least one of the hydrogen concentration and the flow rate is adjusted. In the present embodiment, at least manner, the steel plate 12 is cooled.
[0072]
　Next, the operation and effects of the first embodiment of the present invention.
[0073]
　First, in order to clarify the operation and effect of the first embodiment of the present invention, a comparative example will be described. Cooling equipment 350 according to the comparative example shown in FIG. 20, with respect to the cooling equipment 50 according to the first embodiment of the present invention as described above, and configurations different as follows.
[0074]
　That is, in the cooling equipment 350 according to the comparative example, the cooling gas of the same concentration from a plurality of injectors 52A ~ 52D is injected. Moreover, the cooling facility 350 according to the comparative example, since the hydrogen concentration distribution in the down path space 28 is constant in the vertical direction in the cooling gas of the same concentration from a plurality of injectors 52A ~ 52D is injected, a plurality of intermediate sealing device 56 (see FIG. 2) is not required. Therefore, from the cooling equipment 350 according to the comparative example, a plurality of intermediate seal device 56 is omitted.
[0075]
　In order to enhance the cooling of the steel sheet 12, the plurality of injection nozzles 60 in the plurality of injectors 52A ~ 52D, the cooling gas is perpendicular to the steel plate 12, i.e. to strike in the shortest distance, any of the steel plate 12 It extends along the normal direction of the plate surface. Furthermore, in order to enhance the cooling of the steel sheet 12, the plurality of injectors 52A ~ 52D cooling gas is injected at full flow rate (jet).
[0076]
　Incidentally, with regard to the cooling rate required on the production of the steel plate 12, as seen from the horizontal axis of the TTT (time-temperature-transformation) diagrams is in logarithm, the steel plate 12 as the high temperature region of the steel plate 12 who was rapidly cooled is known to be reduced the amount of the alloy. Therefore, the cooling rate after soaking of the steel plate 12, i.e., as the cooling rate from the cooling starting of the steel plate 12 in the cooling zone 20 is high, a high strength can be obtained with a small alloy volume.
[0077]
　Here, the cooling facility 350 according to the comparative example, for example, the most upstream hydrogen concentration of the cooling gas injected from a plurality of injectors 52A ~ 52D, the cooling equipment 50 according to the first embodiment of the present invention as described above If the same in the hydrogen concentration of the cooling gas injected from the injection device 52A with, although it is possible to increase the cooling rate from the cooling starting of the steel plate 12 in the cooling zone 20, the amount of hydrogen is increased, the steel sheet 12 production cost of the increases.
[0078]
　On the other hand, in the cooling equipment 350 according to the comparative example, for example, the hydrogen concentration of the cooling gas injected from a plurality of injectors 52A ~ 52D, the most downstream side in the cooling facility 50 according to the first embodiment of the present invention as described above when the same hydrogen concentration in the cooling gas injected from the injection device 52D, the use amount of hydrogen, and thus, although the manufacturing cost can be reduced in the steel plate 12, the cooling rate from the cooling starting of the steel plate 12 in the cooling zone 20 since the lower, the alloy of the steel plate 12 is lowered, the strength increased steel 12.
[0079]
　Therefore, in order to achieve both quality improvement and cost reduction of the steel plate 12, while increasing the cooling rate from the cooling starting of the steel plate 12 in the cooling zone 20, it can reduce the amount of hydrogen desired.
[0080]
　In this regard, the cooling equipment 50 according to the first embodiment of the present invention shown in FIG. 2, along with an example, the hydrogen concentration of the cooling gas injected from a plurality of injectors 52A ~ 52D, the downstream injection sequentially increases from the apparatus 52D to the upstream side of the injector 52A. A region injector 52D are arranged, a region injector 52C is disposed, the region injectors 52B are disposed, the hydrogen concentration in the order of regions injector 52A is placed has a higher hydrogen concentration distribution is formed .
[0081]
　Therefore, the cooling rate after soaking of the steel plate 12, i.e., it is possible to increase the cooling rate from the cooling starting of the steel plate 12 in the cooling zone 20, it is possible to rapidly cool the steel plate 12 from a higher temperature state. Thus, for example, silicon (Si) and manganese (Mn) while suppressing decrease the amount of alloy, such as, it is possible to obtain high strength.
[0082]
　The hydrogen concentration of the cooling gas injected from a plurality of injectors 52A ~ 52D are sequentially lowered from the upstream side of the injection device 52A to the downstream side of the injector 52D. Therefore, it is possible to reduce the amount of hydrogen.
[0083]
　Incidentally, the cooling facility 350 according to the comparative example shown in FIG. 20, for example, the hydrogen concentration of the cooling gas injected from a plurality of injectors 52A ~ 52D, similarly to the first embodiment described above, the downstream injection also conceivable that in order to increase the apparatus 52D to the upstream side of the injector 52A.
[0084]
　However, the cooling facility 350 according to the comparative example, the plurality of injection nozzles 60 at a plurality of injectors 52A ~ 52D are both extend along the normal direction of the plate surface of the steel plate 12. From the tip of the injection nozzle 60, as the distance to the injection direction of the steel plate 12 is short, it is possible to increase the cooling capacity of the steel plate 12. On the other hand, if too close to the tip of the injection nozzle 60 to the steel plate 12, or the steel plate 12 collapses the shape is sheet passing, when the steel plate 12 is or vibration, the tip of the injection nozzle 60 is brought into contact with the steel plate 12, the injection nozzle 60 or damage to, or Kizutsuke the steel plate 12. Therefore, the gap between the steel plate 12 and the injection nozzle 60 and Tsuban lowest possible distance, that extend along the injection nozzle 60 in the normal direction of the plate surface of the steel plate 12 was due a person skilled in the art knowledge .
[0085]
　Thus, for example, upstream high cooling gas of the injected hydrogen concentration from the injection device 52A of, will flow to other areas of low hydrogen concentration against the steel plate 12. On the other hand, the inlet port 64 and the corresponding upstream side of the injector 52A is lower cooling gas and the concentration of hydrogen injected from the injection device 52B located on the downstream side, located upstream of the injection device 52A gas not containing hydrogen from the intermediate path space 26 and the like is sucked by mixed. Therefore, it becomes impossible from the upstream side of the injector 52A ejects high cooling gas hydrogen concentration.
[0086]
　Also, when attempting to reserve the hydrogen concentration of the cooling gas injected from the upstream side of the injection device 52A, it is necessary to add hydrogen to the cooling gas injected from the upstream side of the injection device 52A, the production cost of the steel plate 12 To increase.
[0087]
　Furthermore, for the injection device 52D on the downstream side, this inlet port 64 and the corresponding downstream side of the injector 52D is contaminated with a high cooling gas concentration of hydrogen injected from the injection device 52C such as located on the upstream side It is inhaled. Therefore, the hydrogen concentration of the cooling gas injected from the downstream side of the injector 52D becomes higher, the predetermined hydrogen concentration can not be obtained.
[0088]
　In this regard, the cooling equipment 50 according to the first embodiment of the present invention shown in FIG. 2, as shown in FIG. 5, each injector 52, the vertical direction of the injection device 52 of the plurality of injection nozzles 60 injection nozzles 60 positioned on opposite sides of, are inclined toward the central side in the vertical direction of the injector 52 toward the tip side. Then, from the opposite sides of the injection nozzle 60, the cooling gas is injected toward the center side in the vertical direction of the injector 52. Therefore, it is possible to cool the gas striking the injected from the both sides of the injection nozzle 60 the steel plate 12 can be inhibited from spreading in the vertical of the injector 52.
[0089]
　Thus, as shown in FIG. 4, a region injector 52D are arranged, a region injector 52C is disposed, the region injectors 52B are disposed, the hydrogen concentration in the order of regions injector 52A is disposed together can maintain a high hydrogen concentration distribution, it is possible to further reduce the amount of hydrogen. In particular, due to rapid cooling is desired, the top of the injector 52A, by which can maintain a high hydrogen concentration distribution, increase of the injection distance to the steel plate 12 from the tip of the injection nozzle 60 due to the tilted injection nozzle 60 it is possible to ensure a high cooling ability outweigh the decrease in cooling capacity.
[0090]
　Further, as shown in FIG. 5, each injector 52, the remainder of the plurality of injection nozzles 60 except the injection nozzle 60 located on both sides of the above among a plurality of injection nozzles 60, the law of the plate surface of the steel plate 12 extending along the line direction. Then, from this remaining injection nozzle 60, the cooling gas is injected along the normal direction of the plate surface of the steel plate 12. Therefore, the remaining cooling gas from the injection nozzle 60 at the shortest distance toward the steel plate 12 is injected, and, since the cooling gas impinges perpendicular to the steel plate 12, it is possible to the steel plate 12 efficiently cooled, the steel plate 12 thereby improving the cooling properties.
[0091]
　Moreover, the suction port 64 is arranged between the injection nozzle 60 located on either side vertically of the injector 52. Accordingly, the cooling gas injected from a plurality of injection nozzles 60 is sucked into the suction port 64 without diffusion, it is possible to efficiently recover the cooling gas by inlet 64.
[0092]
　Further, as shown in FIG. 4, between the pair of injectors 52A and the pair of injectors 52B, between the pair of injectors 52B and the pair of injectors 52C, and a pair of injector 52C and a pair of between the injector 52D is sealed by an intermediate sealing device 56, respectively. Therefore, since one of the cooling gas to the other region located on both sides of each intermediate seal device 56 can be prevented from flowing out, it is possible to properly maintain the hydrogen concentration distribution.
[0093]
　Further, FIG. 8, as shown in FIG. 9, the intermediate seal device 56 has a double seal structure of the upstream-side seal portion 88 and the downstream-side seal portion 90. Therefore, it is possible to improve the sealing property by the intermediate seal device 56.
[0094]
　Further, the intermediate seal device 56, the upstream support roll 92, upstream the first seal portion 94, the upstream side second seal portion 96 and, upstream roller seal portion 98, downstream support roll 102, the downstream side first seal section 104, the downstream side second seal portion 106, and, is placed against the downstream roller seal portion 108 are reversed.
[0095]
　Thus, a gap 142 between the steel plate 12 and the upstream second seal portion 96, the downstream support roll 102, the downstream side first seal portion 104, and can be blocked by the downstream roller seal portion 108. Similarly, the gap 144 between the steel plate 12 and the downstream-side second seal portion 106, the upstream support roller 92, the upstream first sealing section 94, and can be closed with the upstream roller seal portion 98. This makes it possible to further improve the sealing property by the intermediate seal device 56.
[0096]
　Further, as shown in FIG. 2, a plurality of injectors 52A ~ 52D, and a plurality of intermediate seal device 56 is disposed in the down path space 28, a plurality of injectors 52A is a down path space 28 It is located at the top. Therefore, a small hydrogen specific gravity is by moving upwardly through the gap or the like of the intermediate seal 56, the plurality of injectors 52A is disposed regions, the concentration gradient of hydrogen concentration increases toward the upstream side becomes higher is formed . Thus, since the steel plate 12 is rapidly cooled immediately after being delivered to the down path space 28, it is possible to increase the cooling rate from the cooling starting of the steel plate 12 in the cooling zone 20 more.
[0097]
　The cooling gas injected from the downstream side of the injector 52D, the other plurality of injectors 52A, 52B, is set to a lower hydrogen concentration than the cooling gas injected from 52C. Therefore, in a region where injection device 52D is disposed on the downstream side, the other plurality of injectors 52A, 52B, 52C can be slowly cooling the steel plate 12 as compared to the arrangement area. Thus, since it becomes easy to adjust the temperature of the steel plate 12, it is possible to improve the controllability of the quenching end point temperature which is important to the strength of the steel sheet 12.
[0098]
　Next, a modified example of the first embodiment of the present invention.
[0099]
　In the first embodiment, in each injector 52, the remainder of the plurality of injection nozzles 60 except the injection nozzle 60 located on either side of the vertical direction of the injection device 52 of the plurality of injection nozzles 60, the plate surface of the steel plate 12 It extends along the normal direction.
[0100]
　However, for example, as shown in FIG. 11, in each injector 52, a plurality of injection nozzles 60 located above the central portion in the vertical direction of the injection device 52 of the plurality of injection nozzles 60, the distal end side vertical may be inclined to face the lower side of the injector 52 toward. Further, a plurality of injection nozzles 60 located below the central portion in the vertical direction of the injection device 52 of the plurality of injection nozzles 60 is inclined toward the upper side in the vertical direction of the injector 52 toward the tip side it may have. That is, in the injector 52, a plurality of injection nozzles 60 may be all inclined.
[0101]
　By such configuration, it is possible to cool the gas injected from each injector 52 can be further suppressed from spreading in the vertical direction of the injector 52.
[0102]
　Further, for example, as shown in FIG. 12, on both sides of the vertical direction of each injector 52, an injection nozzle 60 which is inclined may be provided a plurality, respectively. That is, the number of injection nozzles 60 that slopes provided on both sides of the vertical direction of each injector 52, may be multiple portions.
[0103]
　By such arrangement, minute the injection nozzle 60 to tilt is increased, it is possible to cool the gas injected from the injection device 52 can be inhibited from spreading in the vertical direction of the injector 52. However, the injection nozzle 60 is tilted, the cooling of the path from the inclined jetting nozzle 60 to the steel plate 12 of the cooling gas injected becomes long steel 12 may be decreased, the number of injection nozzles 60 inclined it is desirably set in a range capable of ensuring the cooling of the steel sheet 12.
[0104]
　Further, for example, as shown in FIG. 13, in each injector 52, a plurality of injection nozzles 60 located above the central portion in the vertical direction of the injection device 52 of the plurality of injection nozzles 60, the upper injection from the nozzle 60 may be configured such that the inclination angle in order to lower the injection nozzle 60 is reduced. Further, a plurality of injection nozzles 60 located below the central portion in the vertical direction of the injection device 52 of the plurality of injection nozzles 60 have a small inclination angle in the order from the lower side injection nozzle 60 to the upper side injection nozzles 60 it may be configured in such a way that.
[0105]
　Be configured in this way, while cooling gas injected from each injector 52 is suppressed from spreading in the vertical direction of the injector 52, the cooling of the steel sheet 12 by the cooling gas injected from the injection device 52 it can be ensured.
[0106]
　Further, in the first embodiment, a plurality of injectors 52A upstream, 52B and the downstream side of the plurality of injectors 52C, and the 52D is the same configuration, the upstream side of the plurality of injectors 52A, 52C a plurality of injectors 52C downstream, the number of injection nozzles 60 be arranged or inclination of the plurality of injection nozzles 60 and 52D and the like has become the same as.
[0107]
　However, a plurality of injectors 52A on the upstream side, a plurality of injectors 52C of 52B and the downstream side, the number, etc. of the injection nozzles 60 be arranged or inclination of the plurality of injection nozzles 60 and 52D may be different. Also, may be the number or the like of the injection nozzles 60 be arranged or inclination of the plurality of injection nozzles 60 in the injection device 52A and the injection device 52B is different, similarly, a plurality of injection by the injection device 52C and the injection device 52D nozzle 60 number or the like of the arrangement and inclination to the injection nozzle 60 of may be different.
[0108]
　In the above first embodiment, the cooling facility 50 may have a plurality of injectors 52A ~ 52D of the four stages, the number of stages of the plurality of injection devices, may be many stages.
[0109]
　In the above first embodiment, the intermediate seal device 56 has been a double structure having an upstream side seal portion 88 and the downstream-side seal portion 90 may be a single, triple or more structure .
[0110]
　The intermediate sealing device 56, the upstream support roll 92, upstream the first seal portion 94, the upstream side second seal portion 96, the upstream roller seal portion 98, the downstream support roll 102, the downstream side first seal portion 104 , downstream the second seal portion 106 and, are constituted by downstream roller seal portion 108 may be configured to have other than these members.
[0111]
　In the above first embodiment, a plurality of injectors 52A ~ 52D, and a plurality of intermediate seal device 56 is disposed in the down path space 28. However, for example, for convenience of equipment, if at up path space 24 so as not forced to cool the steel plate 12, as shown in FIG. 14, a plurality of injectors 52A ~ 52D, and a plurality of intermediate seal device 56 may be arranged in the up-path space 24.
[0112]
　Further, a plurality of injectors 52A ~ 52D, and a plurality of intermediate seal device 56 may be arranged in a space other than the down path space 28 and up-path space 24.
[0113]
　In the above first embodiment, the cooling equipment 50 is provided with a plurality of intermediate seal device 56, one of the intermediate sealing device 56 of the plurality of intermediate seal device 56 may be omitted. Also, all of the intermediate seal unit 56 from the cooling equipment 50 may be omitted.
[0114]
　Further, in the first embodiment, although the circulation mechanism 66 for each pair of injectors 52A ~ 52D that face each other across the steel plate 12 are provided respectively, of the steel plate 12 of the plurality of injectors 52A ~ 52D when the injection device arranged in the feed direction is a hydrogen concentration of the cooling gas are the same, common circulation mechanism 66 may be provided for the injection apparatus arranged in the feeding direction of the steel plate 12.
[0115]
　[Second Embodiment]
　Next, a second embodiment of the present invention.
[0116]
　Cooling facility 250 according to a second embodiment of the present invention shown in FIG. 15, with respect to the cooling equipment 50 according to the first embodiment described above (see FIG. 4), and configuration are different as follows.
[0117]
　That is, in the cooling equipment 250 according to the second embodiment of the present invention, the intermediate seal unit 56, and a pair of injector 52C and a pair of injection device 52D between the pair of injectors 52A and the pair of injectors 52B intermediate seal device 56 between have been omitted, respectively, intermediate seal device 56 is disposed only between the pair of injectors 52B and the pair of the injector 52C.
[0118]
　The injector 52A arranged in the feed direction of the steel plate 12, the injection unit 252A is formed by 52B, injector 52C aligned in the feed direction of the steel plate 12, the injection unit 252B is constituted by 52D. A plurality of ejection portions 252A, 252B are the same configuration as each other. In the following, a plurality of ejection portions 252A, when describing collectively each 252B is simply referred to as the injection portion 252 plurality of ejector 252A, respectively 252B.
[0119]
　Injection unit 252A is injection device 52A arranged in the feeding direction of the steel sheet 12, across 52B having a plurality of injection nozzles 60. That is, a plurality of injection nozzles 60 of the injection unit 252A includes a plurality of injection nozzles 60 provided in the injector 52A, and is constituted by a plurality of injection nozzles 60 provided in the injector 52B.
[0120]
　In the injection unit 252A, the injection nozzle 60 located on either side vertical injection portion 252A of the plurality of injection nozzles 60, i.e., an upper injection nozzle 60 in the injection device 52A, the lower side of the injection nozzle in the injection device 52B 60 and is inclined toward the center side vertical injection unit 252A toward the distal end side.
[0121]
　On the other hand, the injection unit 252A, the remainder of the plurality of injection nozzles 60 except the injection nozzle 60 located on either side vertical injection portion 252A of the plurality of injection nozzles 60, the front-rear direction of the injection unit 252A, namely, the steel plate 12 It extends along the normal direction of the plate surface.
[0122]
　Similarly, the injection unit 252B includes a plurality of injection nozzles 60 across the injector 52C, 52D arranged in the feed direction of the steel plate 12. That is, a plurality of injection nozzles 60 of the injection unit 252B includes a plurality of injection nozzles 60 provided in the injector 52C, is constituted by a plurality of injection nozzles 60 provided in the injector 52D.
[0123]
　In the injection unit 252B, the injection nozzle 60 located on either side vertical injection unit 252B among a plurality of injection nozzles 60, i.e., an upper injection nozzle 60 in the injection device 52C, the lower side of the injection nozzle in the injection device 52D 60 and is inclined toward the center side vertical injection unit 252A toward the distal end side.
[0124]
　On the other hand, the injection unit 252B, the remaining plurality of injection nozzles 60 except the injection nozzle 60 located on either side vertical injection unit 252B among a plurality of injection nozzles 60, the front-rear direction of the injection unit 252B, i.e., the steel plate 12 It extends along the normal direction of the plate surface.
[0125]
　Then, the cooling facility 250 according to a second embodiment of the present invention, a plurality of injectors 52A constituting the injection unit 252A, from 52B, the injection of a plurality of a plurality of injectors 52C, 52D which constitutes an injection unit 252B cooling gas high hydrogen concentration than the cooling gas being is injected. Then, the down path space 28, the hydrogen concentration is high hydrogen concentration distribution is formed than in the region it is in the injection unit 252B is arranged downstream of the region of the injection portion 252A is disposed upstream.
[0126]
　Note that the injection device 52A and the injection device 52B, the hydrogen concentration of the cooling gas to be injected may be the same, also, who injectors 52A may be a high hydrogen concentration of the cooling gas to be injected than injection device 52B. Similarly, the injection device 52C and the injection device 52D, the hydrogen concentration of the cooling gas to be injected may be the same, also, who injector 52C may be higher hydrogen concentration of the cooling gas to be injected than injection device 52D .
[0127]
　Further, the cooling facility 250 according to a second embodiment of the present invention, the injection unit 252A, a suction port 64 corresponding to the respective 252B are formed. The inlet port 64 on the upstream side of the injection portion 252A and the upstream, are connected by the same circulation mechanism in the first embodiment described above, similarly, inlet port 64 on the downstream side of the injection portion 252B and the downstream It is connected by a circulation mechanism.
[0128]
　Inlet 64 of the upstream side are preferably arranged between the injection nozzle 60 located on either side vertical injection unit 252A. In the present embodiment, as an example, the suction port 64 of the upstream injection unit 252A (a plurality of injectors 52A, 52B) is arranged in the center portion of the arrangement is the high hydrogen concentration regions.
[0129]
　Inlet 64 downstream, preferably arranged between the injection nozzle 60 located on either side vertical injection unit 252B. In the present embodiment, as an example, the suction port 64 on the downstream side of the injection unit 252B (multiple injectors 52C, 52D) is arranged in the center portion of the arrangement is low hydrogen concentration regions.
[0130]
　Next, the operation and effects of the second embodiment of the present invention.
[0131]
　Also in the cooling facility 250 according to a second embodiment of the present invention, similarly to the first embodiment of the present invention described above, a plurality of injectors 52A on the upstream side is injected from the injection unit 252A constituted by 52B cooled gas, a plurality of injectors 52C of the downstream hydrogen concentration is set higher than the cooling gas injected from the configured injection unit 252B by 52D. Then, the down path space 28, the hydrogen concentration is high hydrogen concentration distribution is formed than in the region it is in the injection unit 252B is arranged downstream of the region of the injection portion 252A is disposed upstream.
[0132]
　Therefore, the cooling rate after soaking of the steel plate 12, i.e., it is possible to increase the cooling rate from the cooling starting of the steel plate 12 in the cooling zone 20, it is possible to rapidly cool the steel plate 12 from a higher temperature state. Thus, for example, silicon (Si) and manganese (Mn) while suppressing decrease the amount of alloy, such as, it is possible to obtain high strength.
[0133]
　The cooling gas injected from the downstream side of the injection unit 252B, the hydrogen concentration is set lower than the cooling gas injected from the upstream side of the injection portion 252A. Therefore, it is possible to reduce the amount of hydrogen.
[0134]
　Moreover, in each injector 252, the injection nozzle 60 located on either side of the vertical direction of the injection portion 252 of the plurality of injection nozzles 60 is inclined toward the center of the vertical direction of the injector 52 toward the tip side doing. Then, from the opposite sides of the injection nozzle 60, the cooling gas is injected toward the center side in the vertical direction of the injection portion 252. Therefore, it is possible to cool the gas striking the injected from the both sides of the injection nozzle 60 the steel plate 12 can be inhibited from spreading in the vertical injection unit 252.
[0135]
　Thus, towards the region of the upstream the injection unit 252A is arranged, it is possible to maintain the hydrogen concentration is high hydrogen concentration distribution than the region of the downstream injector 252B are disposed, the amount of hydrogen it can be further reduced.
[0136]
　Further, the respective injection portions 252, the rest of the plurality of injection nozzles 60 except the injection nozzle 60 located on either side of the vertical direction of the injection portion 252 of the plurality of injection nozzles 60 is in the normal direction of the plate surface of the steel plate 12 along it extends. Then, from this remaining injection nozzle 60, the cooling gas is injected along the normal direction of the plate surface of the steel plate 12. Therefore, the remaining cooling gas from the injection nozzle 60 at the shortest distance toward the steel plate 12 is injected, and, since the cooling gas impinges perpendicular to the steel plate 12, it is possible to the steel plate 12 efficiently cooled, the steel plate 12 thereby improving the cooling properties.
[0137]
　Moreover, the suction port 64 on the upstream side is disposed between the injection nozzle 60 located on either side of the vertical direction of the injection unit 252A. Accordingly, the cooling gas injected from a plurality of injection nozzles 60 in the ejection portion 252A is sucked into the suction port 64 on the upstream side without diffusion, it is possible to efficiently recover the cooling gas by inlet 64 of the upstream-side . Similarly, inlet port 64 downstream, since it is arranged between the injection nozzle 60 located on either side of the vertical direction of the injection unit 252B, the cooling gas injected from the plurality of injection nozzles 60 in the injection unit 252B it can be efficiently recovered by the suction port 64 on the downstream side.
[0138]
　Also, between the ejection portion 252A and the injection unit 252B is sealed by an intermediate sealing device 56. Therefore, since one of the cooling gas to the other region located on both sides of the intermediate seal device 56 can be prevented from flowing out, it is possible to properly maintain the hydrogen concentration distribution.
[0139]
　Next, a modified example of the second embodiment of the present invention.
[0140]
　Said in the second embodiment, the injection unit 252A, the remainder of the plurality of injection nozzles 60 except the injection nozzle 60 located on either side vertical injection portion 252A of the plurality of injection nozzles 60, the plate surface of the steel plate 12 It extends along the normal direction.
[0141]
　However, for example, as shown in FIG. 16, a plurality of injectors 52A constituting the injection unit 252A, the upstream side of the injection device 52A of 52B, injectors according to a plurality of injection nozzles 60 are all directed toward the distal end side 52A in the vertical direction may be inclined to face the lower side. Further, a plurality of injectors 52A constituting the injection unit 252A, the downstream side of the injector 52B of 52B, so that a plurality of injection nozzles 60 toward the upper side in the vertical direction of the injection device 52B toward the both distal end it may be inclined. That is, in the injection section 252A, a plurality of injection nozzles 60 may be all inclined.
[0142]
　By such a configuration, the cooling gas injected from the injection unit 252A can be further suppressed from spreading in the vertical direction of the injection unit 252A.
[0143]
　Further, for example, as shown in FIG. 17, a plurality of injectors 52A constituting the injection unit 252A, the upstream side of the injection device 52A of 52B, injectors according to the upper side of a plurality of injection nozzles 60 toward the tip side 52A in the vertical direction may be inclined to face the lower side. Further, a plurality of injectors 52A constituting the injection unit 252A, the downstream side of the injector 52B of 52B, so that the plurality of injection nozzles 60 of the lower side toward the upper side in the vertical direction of the injection device 52B toward the distal end side it may be inclined to. That is, the number of injection nozzles 60 provided on both sides of the vertical direction of the injection unit 252A inclined may be plural.
[0144]
　By such arrangement, minute the injection nozzle 60 to tilt is increased, it is possible to cool the gas injected from the upstream side of the injection portion 252A can be inhibited from spreading in the vertical direction of the injection unit 252A.

claims

Heating zone strip of steel is sequentially transmitted, soaking zone, and, more while being arranged in said cooling zone in a continuous annealing furnace, arranged in the feed direction of the steel plate, the cooling gas hydrogen is added with cooling zone a plurality of ejection portions for ejecting respective said steel plate from the injection nozzle of
　the by the plurality of ejection portions of the cooling zone are disposed space, towards the upstream side of the region has a higher hydrogen concentration than the region of the downstream as the hydrogen concentration distribution is formed, the plurality of the hydrogen concentration adjusting unit for adjusting the hydrogen concentration of the cooling gas injected from each injection unit,
　comprising a
　respective plurality of injection nozzles in the plurality of ejection portions , together arranged a feeding direction of the steel sheet as an array direction, which respectively extend toward the steel plate,
　injection nozzles located on opposite sides of at least the arrangement direction of each of said plurality of injection nozzles Are inclined toward the center side of the array direction toward the distal end side,
　the cooling equipment in continuous annealing furnace.
[Requested item 2]
　Among the plurality of injection nozzles, the remainder of the injection nozzle except for the ejection nozzles located on opposite sides of said arrangement direction extends along the normal direction of the plate surface of the steel sheet,
　continuously according to claim 1 cooling equipment in the annealing furnace.
[Requested item 3]
　Further comprising an intermediate sealing device disposed between the plurality of ejection portions,
　the intermediate seal unit,
　the upstream support roll which supports the steel plate from the plate thickness direction one side of the steel sheet,
　with respect to the upstream support roll is disposed on the downstream side of the feeding direction of the steel sheet, and the downstream-side support roller for supporting the steel sheet thickness direction other side of the steel sheet,
　is arranged on the opposite side of the steel sheet with respect to the upstream support roll, said cooling zone an upstream first seal portion extending toward the upstream support roll from the inner wall of the furnace body for forming the,
　disposed on the opposite side to the upstream support roll with respect to the steel plate, toward the steel plate from the inner wall of the furnace body an upstream second seal portion extending Te,
　wherein disposed on the opposite side of the steel sheet for downstream support roll, downstream first sea extending from the inner wall of the furnace body to said downstream support roll And parts,
　are disposed on the opposite side to the downstream support roll with respect to the steel sheet, and a downstream second seal portion extending toward the steel plate from the inner wall of the furnace body,
　between the upstream support roll, the said upstream an upstream roll seal portion for closing the gap between the steel plate and the first seal portion,
　the at a downstream support roll, the downstream roller seal portion for closing the gap between the steel plate and the downstream first seal portion and
　having,
　cooling equipment in continuous annealing furnace according to claim 1 or claim 2.